Best Kids Base Layers 2026

I’ll be the first to admit that I was late to jump on the base layers for kids bandwagon. I’ve always loved and worn them as an adult, but I did not appreciate until very recently how much they truly make a difference in keeping kids warm from the inside out.

It’s easy to forget about or neglect this thin layer when thinking about winter gear for kids. Keeping kids warm for winter already requires a lot of gear (warm boots, mittens, snow pants, jackets, fleece, wool socks etc.).

I’ve always prioritized the gear on the outside but with time I’ve discovered that one of the best secrets for truly keeping kids warm is the layer on the inside.

I am now the biggest kids base layer convert, and I’m baffled on why it has taken me so long to invest in quality base layers for my kids.

If you’ve also been on the fence on whether quality base layers are worth the investment, then this post is for you. Below is a list of favorite base layers for kids of all ages with input from the entire Mountain Mama Team.

It turns out we have lots of favorite brands for base layers for different ages and stages. Thankfully, there are lots of great options out there.

Thinking about your budget and the needs and preferences of your child can help you make the best choice for your child. We also have several discount codes for winter gear to help save some money.

This post may contain affiliate links. As an Amazon Associate and member of other affiliate programs, if you purchase something through one of these links and use the discount codes provided, we may earn an affiliate commission at no cost to you.

All products and brands recommended are hand selected by our team, so thank you for supporting us by clicking through!

Why Base Layers Are So Important

Base layers will be a game changer for your kids if they aren’t already using them, as they serve as the foundation for staying warm and dry in any weather.

What is a Base Layer?

A base layer is the layer worn closest to your skin. Most base layers tend to be on the thinner side but they come in variable thicknesses.

A good base layer should be able to keep you warm and cozy while also wicking away moisture.

Since the main purpose of a base layer is to move moisture away from the skin, the best base layers will have good wicking properties.

Goal of Base Layers

Since this is the layer worn closest to the skin there are several important factors to consider when thinking about what kind of base layer will work best for your kid.

Base layer materials and how they feel

First, it’s important to consider what material will work best for your child. Knowing your childs’ sensory needs and what kind of fabrics they do/don’t like can help you make a more informed choice on what brand will be a good fit.

Consider how much your kids sweat

Another thing to consider is how much your child tends to perspire. Tweens and teens who are more prone to sweat might prioritize a material with good odor-wicking capabilities, while this might be of little importance for those with young babies.

Consider how warm or cold your kids run

Finally, it’s a good idea to know your child’s preferred temperature. One of my girls is always hot. Getting her to wear a coat outside in the winter is like pulling teeth.

On the flip side, I have another child who is always complaining of being cold. Her teachers at school tell me every year that she wears her winter coat in the classroom all day long.

I often wish I could pass off the heat from my hot child to warm up my freezing child. Sadly, this cannot be done, but it has helped me recognize the importance of picking out base layers based on my children’s natural preferences.

My child who runs hot prefers a thin, synthetic or merino wool layer, and my child who’s always cold loves a thicker merino wool layer or doubling up her base layer with a mid layer over top.

How Base Layers Should Fit

To best take advantage of the warmth that base layers can provide, the fit should be a snug, close to body fit. Many call base layers a ‘second skin,’ and this is how I like to think about them. The base layer doesn’t need to be constrictive, and some kids may like a more relaxed fit. However, for optimal moisture wicking, the ideal fit is for them to be snug like an additional layer of skin.

When to Wear Base Layers

Base layers are not only for winter wear under ski/snow gear (although this is a great use for them). The great thing about base layers is that they can be used for recreational activities all year long.

They make great pajamas for camping in the summer, and they are a great layer for under rain and snow jackets. Merino wool stays warm even when damp, and synthetic fabrics tend to dry quickly.

Both have different strengths in wet environments.

We find base layers are also essential to take hiking or backpacking when the temperature tends to fluctuate more.

Wool or Synthetic Base Layers?

Most base layers come in two main fabrics: merino wool or synthetic and both have advantages and disadvantages. The type that is best for your family will depend on your needs, activities, and budget. Merino and synthetics can both be worn year-round (yes, wool in the summer too!).

Merino Wool Base Layers

Merino wool comes from a special type of sheep called a Merino sheep. These sheep have very fine, soft wool fibers that contain lanolin, a natural antibacterial agent. The favorite features of Merino wool base layers are that they are warm when wet, odor resistant, sustainable, and soft.

Merino wool is great at temperature regulation and will help keep you warm on colder days and cooler on warmer days. Merino doesn’t dry fast if it is not in a dry environment; however, it will still keep you warm and won’t make you feel clammy even when wet.

The downside to Merino is that it is delicate, and care must be taken to not damage the delicate fibers. Items can get snagged on Velcro, tree branches, hangnails, and gear. However, it is often repairable with a little needle and thread.

I learned the lesson about Merino’s delicacy the hard way when the first time my daughter was wearing her merino base layers, she got a hole in the knee. Thankfully, little holes are easy to repair, but it made me appreciate how delicate the fabric can be. That said, many families use them on a daily basis AND wash and dry them, and they last for multiple kids.

Merino is best for layering in the cold or for multi-day use when you don’t want to pack a lot of base layers.

Examples: Smartwool, Ik’splor, Ellas Wool, Sloomb, Wildhaven Wools

Synthetic Base Layers

Synthetic base layers are most often made of polyester, nylon, spandex, etc. They come in a wide range of styles, price points, and technologies, like adding silver to aid in antimicrobial properties.

Although synthetic base layers dry fast when wet, they do not keep you as warm when they are wet and can often leave you feeling clammy if the material doesn’t have airflow to dry.

Synthetics are best for warmer temps, more aerobic activities, or if there is prolonged wetness (from the environment or sweat). They’re also great for kids who have wool allergies.

Examples: Patagonia Capliene, REI, Akova, Jan & Jul

Mixed Blend Base Layers

Some companies have started mixing Merino wool and synthetic materials to try and capture the best of both worlds. They start with using Merino wool for its odor resistance, breathability, and softness. Then add in some polyester to aid in faster wicking and making the product lighter weight.

These mixed blend items are great for higher intensity aerobic activities when you still want the best wool properties but want to stay drier.

Examples: Helly Hensen, Reima

So, What Base Layer is Best?

Both Merino wool and synthetic base layers stand out in certain areas and most of us have a mix of synthetic and Merino base layers. It all comes down to personal preference and what kind of material is best for the activities you are doing.

Best Base Layers for Babies

Babies who are doing less walking and more riding get colder than adults because they are not generating their own heat. Make sure they stay warm by layering them with warm base layers.

Ella’s Wool

Ella’s Wool is a company based out of Brooklyn, NY. Becca’s Norwegian roots were her inspiration to start the company when she couldn’t stand to see empty playgrounds in the winter after moving to New York.

What we love about Ella’s wool is that the merino wool is super soft and warm. They claim to be buttery soft, and I can vouch for how warm and cozy they are. These are probably the softest base layers on this list.

You can read our full review on Ella’s Wool TUBES as well. These are a great heavier-weight wool base or mid-layer for kids 9 months-7years.

The Ella’s Wool base layers are so soft and snuggly. I didn’t like that the baby set only had footed bottoms, so I purchased a onesie and un-footed pant separately. This was great because I was able to use them longer and didn’t worry about extra pressure on the bottom of the feet when in a carrier.

TMM Team Member Jami

Ik’splor Kids Base Layer

Iksplor’s tagline is that better days start with a better base. This company, based out of Jackson, WY has two great merino wool options for babies.

They have a baby leggings and long sleeve, and baby adventure one-piece.

The Ik’splorer set and adventure onesie both have handmitts for sun and snow and are made of 100% merino wool. Unlike Ella’s wool, the feet are open on the Ik’splorer set and the baby adventure onesie.

The main difference between the two options is that the adventure onesie is made with a mid-weight wool while the Ik’splor set is thinner. The onesie might be the preferred option if you are in frigid temps or want a looser fitting mid-layer.

If your baby is in between sizes then I would order the size larger. They also carry an adventure blanket made of the same soft material and its good for so many uses! If you are looking for more info, check out our full review of Iksplor Adventure Wear.

The 3-6 month Ik’splorer set fits quite snug on my average sized 3mo daughter and she will outgrow it sooner than I was hoping. I wish I ordered the 6-12 month option so she had more growing room for the future.

TMM Team Member Stephanie

Wildhaven Wools

Wildhaven Wools is a woman-owned small business based out of Haines, Alaska. They carry sizes from infant to big kid; their softness makes them especially well-suited to babies, but all ages will love the feel of this fiber and the simple yet striking design.

They are made in lightweight merino with their trademark mountain appliqué. For babies, they have two different kids of sets: Essentials Crew and Legging Set and the Baby Crew and Jogger Set.

Wildhaven’s baselayers feature a “grow with me” design that will ensure the woolies fit for years or fit several kids at once. The cuffs can be folded over for a smaller child, and then extended as they grow.

Wildhaven has recently started using some thicker wools and expanding the thickness and coverage in the knee area, which will add to the durability of wool knits for older kids and crawlers.

The Wildhaven Wool baselayers are the softest woolies we own. They’re perfect for sleep and active play when layered under outerwear. I’m thrilled that Julia has been focusing on making the knee area more durable as my kids shred baselayers like it’s their full time job! They fit really well, the wide waistband adds comfort, and I love the contrast coloring of the sets.

TMM Team Member Kristen

Patagonia Infant Capilene

Patagonia Infant Capilene base layers are made with 100% recycled polyester. The new option has a separate shirt and pants. If you come across a used set, you might find the older design, which consisted of a onesie and pants. I personally prefer this design for smaller babies and used it with my children until they began walking.

Best Base Layers for Toddlers and Kids

Toddlers and kids also need warm, cozy base layers. Some of our favorite brands for this age group include: Burton, Nui Organics, Chasing Windmills, Helly Hansen, Ik’splor, Icebreaker, REI, Reima, Smartwool, and Sloomb.

Burton

How can a kid not love a Burton product? They create the most fun patterns with the most kid-friendly prints (although mine prefers the basic black). Their fleece base layer set for toddlers and kids is a great purchase if you want a thick, cozy synthetic layer for your little shredder.

They are also a great layer if you have a kid who doesn’t love the constrictive feeling of other base layers.

Nui Organics

Hailing from New Zealand, Nui Organics creates timeless wool pieces for kids, babies, and adults. Our favorites are the Merino wool knit leggings and sweaters.

They are thick and stretchy, easily layered, and sustainably made. We love them for the cool fall days or as a cozy winter layer. Great for under ski pants or just on their own as you’re out and about.

They have lots of beautiful colors to choose from, and come in adult sizes so you can match with your littles!

Chasing Windmills

Based in Denver, Colorado, Chasing Windmills is a partnership duo making what are easily the softest base layers I’ve ever found. They’re crafted from a midweight, sustainably sourced merino wool that comes in the most beautiful colors. I also love that they’re built for actual play—the reinforced knees are a total game-changer for making them last.

Helly Hansen

Helly Hansen has a mixed blend base layer that is comfy to wear. Helly Hansen uses a 2 layer construction to make these base layers, and they’re designed to wick away moisture for super active kids. They have reinforced fleece patch elbows and knees, which is great for active kids.

HH runs on Euro sizing, so measure your kiddo before ordering to ensure a proper fit, but sizing starts at about a 12-month equivalent size.

When I was looking for Kylie’s first real base layer, we came across Helly Hansen and was pleased that they had nice base layers for tiny humans and a sale sealed the deal. My oldest wore hers for 2 winters and then my youngest was in them (size 92/2 -wears 2T/3T clothing). Aside from a few stains, they have held up great! We loved the reinforced knees!

TMM Team Member Jami

Icebreaker

While Icebreaker base layers are one of the priciest merino wool brands out there, their thermals are called the Oasis for a reason. These base layers are designed to move with the body and contour to every body movement.

The merino wool jersey fabric is designed to be comfortable and soft.

My daughter loves icebreaker shirts…Super warm but not quite as soft as Helly Hansen or Smartwool.

TMM Team Member Jen

My daughter ended up with a pair of Icebreaker base layer bottoms in a bag of hand-me-downs and those have held up incredibly well and are really soft too. She wears them as regular leggings at her nature preschool and we’ve had them for two years (and I think they went through two kids before us) and they still look awesome.

TMM Team Member Cait

Iksplor

Ik’splor not only has a great baby set but they’re base layers for toddlers and kids are also loved by the team. Their kid set is designed to fit long in the torso, back and sleeves to make sure kids are well protected from the elements. The great coverage provided is my favorite part of the Ik’splor design.

I ordered one size up for all my kids and anticipate my kids being able to wear them for 2 seasons with how long the fit is. The wool is neither scratchy nor itchy and the fabric is thin while still holding up well after multiple uses.

My daughter loves the Iksplor set we bought…they are super soft and the right level of thickness, and she’s a huge fan of the thumbholes (who isn’t?).

TMM Team Member Cait

Jan & Jul

If you are looking for a thicker, cozier layer than look no further than Jan & Jul. These thermals are designed to be perfect for everyday wear so they double well as an outfit and thermals.

They are thicker than some of the other brands and they are great for a kid that is going to be more rough and tumble on their clothes.

They are also one of the most affordable base layer sets if you’re not wanting to break the bank.

These new Jan & Jul base layers are nice and thick!

Amelia, TMM Founder

REI Base Layers Toddlers/Little Kids

One of the favorite synthetic layers of the team for toddlers and little kids is the REI lightweight base layer top and bottoms. This is a light weight layer so it’s best for use in the summer (UPF rating of 50) or for a kid who always complains of being hot.

I really like the lightweight REI layers for warmer days. They’re almost halfway between a base layer and a sun layer.

Jamie M., TMM Team Member

My son can’t handle any wool next to his skin so we are a synthetic family. My son really likes the REI lightweight base layers.

Jess, TMM Team Member

Reima Base Layers

Reima seems to be in a league of its own as far as kids’ gear is concerned, and their base layers are no exception. This Finnish brand is constantly impressing our team with all their well-made gear.

Many team members love these base layers due to their thick softness and warmth. Team members also mentioned that Reima base layers are more affordable than other brands, and love having an option that’s high quality but doesn’t break the bank.

Reima has several different styles and base layer fabrics. The variety of different options is almost overwhelming, but I love that there are so many different options at different price points.

Team members reported liking both the polypro Reima base layer (called the Lani) and the merino tencel blend (called the Kinsei).

My personal favorite Reima layer is the Taitoa, which is a merino wool blend that’s mixed with bamboo. I tell every mom who asks me what base layers to buy that these ones are the “overall best base layer” in our home.

Reima also has great mid layers, these merino joggers, the Misam, are thicker and could be a thick base layer or a mid layer. TMM Team Member Jami’s oldest daughter typically uses these as a mid layer on really cold days.

Reima has really great soft and thick polypro base layers.

TMM Founder Amelia

I like the Reima layers, the price is good and they have a merino/tencel blend that is really soft and silky.

TMM Team Member Kristin

My boys love their Reima base layers but often they don’t wear them because they get too warm. Go figure!

TMM Team Member Rita

Sloomb

This is a thicker base layer made of 100% merino wool that provides additional warmth for those in extra cold climates or for kids who are always complaining that they are cold. They make some in a looser fit for kids who struggle with tight-fitting clothes.

One downside of the Raven line is that products are final sale; however it is nice that the tops and bottoms come as separates. The Raven line comes in many beautiful earth tone colors as well, and a wide range of sizes beyond the ones sized just for kids.

We have lived in Sloomb layers for years. They’re really comfortable and wash up great.

TMM Team Member Kristin

Smartwool

Smartwool’s base layers are made with 100% Merino wool. They are thicker than Iksplor as they come in a 250 weight, but they are still soft. We love that you can get coordinating patterns with hats, neck gaiters, adult base layers, and headbands.

Tops and bottoms are sold separately, so you can mix and match patterns too, or get two tops and one bottom if the shirts tend to get dirtier.

We have been using Smartwool Merino 250 base layers with my oldest daughter for 6 years now. She was able to get two years out of one set before sizing up with only a few minor repairable holes. They are still in great shape for little sister. They are warm and soft!

TMM Team Member Jami

Best Base Layers for Tweens/Teens

Choosing the right base layers for tweens and teens is all about balancing high-performance tech with a fit they’ll actually want to wear. These top picks offer the perfect mix of odor resistance and moisture-wicking power to keep up with every adventure.

Helly Hansen has a mixed blend base layer set that is also super popular among the older kids of our team members. Helly Hansen uses a 2 layer construction to make these base layers and they’re designed to wick away moisture for super active kids.

I found Helly Hansen half off on Amazon Warehouse. These are wool and soft. I heard they wear out, but we’re two seasons in and no holes.

TMM Team Member Jen

I grabbed Helly Hansen kids wool base layers on sale and they are the ones my daughter reaches for first.

TMM Team Member Anna

REI Base Layers for Teens

Another brand loved by tweens and teens among our group is the REI Co-op Merino Midweight Tops/Bottoms. Teens tend to like that they are not itchy and feel like they’re a great, comfortable product at a great price point.

The teens favorite base layers are cheap ones I got from the REI brand on clearance.

TMM Team Member Rita

I grabbed a pair of REI brand kid base layer pants for myself on clearance and I like the fit and feel of those better than my more expensive Smartwool bottoms.

TMM Team Member Cait

Akova (formerly ShredDog)

Of all the synthetic blend options available, Akova’s Foundation kids’ base layer seem to be the most loved by the team for the older kids. The Foundation base layer top and bottom come in sizes small to extra large.

Akova is a company that cuts out the middle man and sells direct to you. Their model is designed to get parents quality gear while avoiding the retail markup.

We love that their base layers are moisture wicking, quick drying and have 4-way stretch and hideaway thumb holes. The Akova Foundation base layers are a little thicker material that can also work as a mid-layer. Amelia’s kids prefer them layered with Iksplor for the best base layers for skiing.

Some things to keep in mind with the Foundation is that the large and extra large pants run quite wide in the waist. A bonus of the more relaxed fit and style is that you can layer them over top of a thin base layer on super cold days. Amelia’s girls wear them as their daily leggings, too.

While the Foundation Base Layers are being phased out, the new short sleeve and long sleeve tops pull double duty as a smooth, lightweight base layer or a sun shirt in the summer.

Check out our full review of Akova here!

Budget Base Layer Options

Finding high-quality gear doesn’t have to break the bank, especially since kids tend to grow out of sizes so quickly. These budget-friendly picks are perfect for shorter outings or milder days when you need reliable moisture-wicking and comfort without the premium price tag.

32 Degrees

The best budget option seems to be 32 Degrees sold seasonally at Costco and Amazon. I was able to snag these synthetic base layers for multiple kids for less than $15/pair.

My daughter has a definite sensory preference toward synthetic materials so she wears the 32 Degree brand when it’s not so bad out.

Elaine, TMM Team Member

I have a few pairs of these for my girls as backups, I have got them for $7 a set on sale at Costco. Great for warmer days as they are pretty thin.

Jami, TMM Team Member

Mountain Warehouse

These base layers are a lighter weight Merino wool blend, perfect for warmer weather or aerobic activities. Don’t size up, order your current clothing size.

These base layers are much thinner than most others we have tried and I worry about the longevity, but for the price it was worth a shot! I grabbed some around black Friday for half off. Overall they are not as soft or nice and I probably won’t buy again.

TMM Team Member Jami

Cuddl Duds

I have found that Cuddl Duds are the ultimate “easy win” for chilly mornings because they are so soft my kids actually want to wear them. They are lightweight enough to layer under jeans without any complaints about bulk, making them my go-to for school days or quick trips to the park.

Caring for Your Base Layers

Keeping your base layers in tip-top shape will allow them to perform better, last longer, and give you some good resale value on those expensive merino wool pieces.

Merino Care

Due to the natural odor-resistant properties of merino, your merino pieces can go quite a while without washing. They do NOT need a wash after every wear. TMM Team Member Jami only does a wool clothing load every couple of weeks, depending on use (and that’s even on her sweaty running Merino!).

Most Merino pieces listed here can be machine washed on cold/delicate. A wool wash is recommended by most brands to keep the Merino in tip-top shape. Check out Nikwax Wool Wash to keep your wool fresh. Most Merino pieces listed (except Ella’s Wool) can also be tumble dried on low.

About once a month, I gather all the Merino I can find in the house and wash with Nikwax Wool Wash. It comes out smelling fresh and its nice and soft after drying.

TMM Team Member Jami

Synthetics Care

Synthetic base layers tend to be a little more durable in the wash. They will require more frequent washing than your Merino layers, likely after every sweaty use, might get 2 wears out of an item if not sweaty. Nixwax Basewash is a great way to keep those base layers clean. A lot of detergents can leave residue behind that hangs onto odors. Base wash helps clean and deodorize synthetic base layers.

Most synthetics can be tumble-dried on low, but air drying is best for some pieces.

Keeping Kids Warm Starts With a Good Base

Base layers will be a game changer for your kids if they aren’t already using them. If your kids aren’t loving their current set or seem to be avoiding them, it’s usually a sign that the fit, fabric, or style just isn’t hitting the mark.

I’ve learned from experience that true warmth starts from the inside out—when kids feel cozy and comfortable, they’ll stay out and play much longer with way less complaining.

Did I miss any of your go-to brands? I’m always looking for new favorites to test out with my own kids and add to my reviews, so please share what’s working for you!

Related Articles:

• Best Winter Gear for Kids
• Best Base Layers for Women
• Best Winter Boots for Kids 2023
• Kids Winter Hats: Beanies to Balaclavas
• How to Clean Your Outdoor Gear

Best Base Layers for Kids

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