The Best Baselayers For Snowboarding and Skiing: 2026 Edition

At a Glance

Product	Award	Main fibre	Best for	Price
Smartwool Intraknit Thermal Max	Best Heavy Baselayer	Merino (97%)	Cold active pursuits	~$160 USD
Icebreaker 200 Oasis	Best Active Baselayer	Merino (100%)	Go-getters who are moving more often than not	~$105 USD ·
Mammut Tree Wool Thermal FL Tights	Best High-Output Baselayer	Lyocell-merino blend	High-output activities in cold weather	~$119 USD
Arms of Andes Half Zip	Best Natural Baselayer	Alpaca (100%)	People prioritizing sustainability and warmth	~$135 USD ·
Airblaster Ninja Suit	Best One-Piece Baselayer	Merino blend	Head-to-to seamless warmth	~$260 USD ·
Patagonia Capilene	Best Synthetic Baselayer	Recycled polyester	Ultralight fans who don’t overheat	~$109 CAD
Paka Thermal Crew	Most Innovative	Alpaca-merino-Tencel blend	Moderate to lower activity	~$145 USD
Arc’teryx Rho SV Zip Neck	Best Baselayer For A Solo Layer	Hollow-core polyester fleece	High-output activity where layering is optional	~$140 USD

Specs verified October 2026 against manufacturer and major retailer pages. Prices drift by retailer and region.

Best Heavy Baselayer: Smartwool Intraknit Thermal Max

Sometimes it’s hard to differentiate base layers in a sea of merino and other fibres claiming to be the best. But Smartwool has raised the bar with their Intraknit collection by creating a 3D pattern without tons of seams looking like patchwork to reinforce the high-use areas such as elbows, knees, and hips.

Despite feeling a bit bulkier than your average under layer, the stretch in the fabric is remarkably responsive, allowing for high-performance movement for all the spins, stomps, and spills that come with a day of shredding hard.

And while it performed well even in -10º C temperatures, I never felt overheated, even on long tours. They really seem to have cracked some type of code here for the perfect balance of warmth, stretch, and protection. Innovations in base layers don’t come every day but Smartwool’s Intraknit fabric is one to write home (or in a blog post) about.

Best Active Baselayer: Icebreaker 200 Oasis

Icebreaker’s 200 Oasis is everything you’d expect in a good thermal base layer. It is comfortable, breathable, and kept me warm in both active conditions and sitting still. It’s also remarkably thin for its warmth, which is a testament to good quality Merino wool. But on top of the materials, it’s the craftsmanship that stands out, and this has stood the test of time. Over 100 days wearing it, from cold storm days to spring hikes, and it’s still going strong.

Merino really does live up to the hype, and so does Icebreaker. Sure it’s gotten bigger but as far as I’ve seen, the quality hasn’t suffered. That just means better quality control and new product innovation. For a standard baselayer to keep you warm and dry while skiing and riding, this one hits all the right notes.

You can also check out an in-depth review of the Icebreaker 200 Oasis that gives you a bit more detail.

Best High-Output Baselayer: Mammut Tree Wool Thermal FL Tights

It’s the perfect blend of natural and synthetic, where the synthetic spandex gives the stretch, without being overbearing at only 6%. And the natural side of it has everyone’s favourite wool, merino, but also includes a fibre called lyocell.

Merino is generally a bit itchy, but the big standout was the near-cool feel of the material. I can only put it down to the lyocell, which I’ve never tried before but am an instant fan. As soon as I got active, I could tell that the breathability of the material was also on another level. Despite being active, they still felt cool to the touch. Honestly, I was kind of blown away.

Although I haven’t taken these into the backcountry yet, the fact that they kept me warm outside and didn’t collect sweat told me all I need to know. They work and are something unique. My guess is that you probably need to be active for it to be better than merino in the warmth department. But consider this one of the best endorsements from someone whose only benefit was getting a free sample, and who is stoked to take them on big climbs this winter.

Read the full Mammut Tree Wool Thermal FL Tights review →

Best Natural Baselayer: Arms of Andes Half Zip

Alpaca wool has been around forever, but only recently has it hit the mass-market consumer circuit in the west. But what hilltop villages in South America have known for centuries is now becoming more mainstream due to Alpaca wool’s outstanding properties. Merino has been the leader for quite some time, but companies pushing Alpaca are trying to give it a run for its money.

Arms of Andes is one of the leaders for manufacturing alpaca wool baselayers. I really enjoy wearing their half zip top and pants. They are warm, soft, and comfortable, with the smallest amount of stretch to allow for good movement without letting any air in. The softness is definitely a step above Merino, which can tend to get itchy, especially on the chest (at least for this reviewer).

There isn’t much in the negative side for Alpaca wool, only that perhaps you’ll find it a bit bulkier than Merino, and in some cases, a little too warm when really pushing yourself hard. But for cold weather, or lower activity that isn’t high-endurance mountaineering, the softness and warmth of Alpaca wool, as well as its low environmental footprint, makes it worth checking out.

Best One-Piece Baselayer: Airblaster Ninja Suit

Of all the different products tested for winter gear, Airblaster’s Ninja Suit ranks high in terms of utility, warmth, and sheer cool factor. Of course, it’s not exactly cool in the fashion sense, being that very few people will actually see you wearing it (at least in its full entirety). It’s also not exactly cool in the warmth sense, being that it’s meant to keep you warm. Dad jokes aside, the Merino version actually does a great job in the temperature regulation department.

It’s all the little things that make the Ninja Suit stand out as a must-have. The full-width butt zipper for easy evacuation is a welcome feature, as is the drawstring in front to keep everything tidy. Thumb holes help the sleeves from bunching up, and the hood keeps your head warm even if that’s all you’re wearing.

Now that it’s been out a few years and is popular as ever, the Ninja Suit offers a few different options in both materials and styles. They even have a kids version for the little rippers to stay warm as well. But there will be something that speaks to you, no doubt. And you might want to get a few pairs because you will want to have one while the other is in the wash… I made the mistake of only having one and prolonging the wash interval because I didn’t want to not have it available. Pee-you!

Best Synthetic Baselayer: Patagonia Capilene

Synthetic is a broad term, but for the most part, we’re talking polyester here. And polyester is just a fancy word for plastic fibres woven together to make all kinds of textile materials. Especially when talking the outdoor industry, it’s pretty much out there ubiquitous these days.

Patagonia’s brand has become synonymous with environmental responsibility. They have led the industry for decades with innovations in textile manufacturing, and continue to do so. With their Capilene series, the brand expands on their environmental responsibility to offer baselayers that are fair trade certified, and whose polyester is 100% recycled, both good things for our planet.

I’m not a huge fan of synthetic base layers due to the breathability factor. But Patagonia did in fact use some innovations to make it a bit better. Polyester has a reputation for trapping in sweat, and while the capilene series is no different, it does have the HeiQ antimicrobial treatment to keep the smell at bay.

The upside to polyester is how lightweight it is. Indeed, it barely feels like there’s anything there, coming in at only 6 oz. So for ultralight purists, this is a good option. Still, polyester is polyester, but if you choose to go the synthetic route, you might as well do as little environmental impact as possible.

Most Innovative: Paka Thermal Crew

We’ve already stated that Alpaca wool is a good thing, but it’s worth stating again. It really is warmer, ounce-for-ounce, than anything else and probably one of the most sustainable fibres on Earth. Paka is a brand with a bunch of US money behind it but from everything we have seen from them, they are one of the good ones out there.

The blend of alpaca wool, merino, and a fibre called Tencel which uses wood pulp primarily from eucalyptus trees, you can tell they care about sustainability. Their supply chain is a bit more complicated though which can always muddy the waters for vetting the claims though, so more research would be needed to verify before doing their PR work for them. But it’s a comfortable pair of long underwear, no doubt.

I found this to get pretty warm when hiking, so this is the type of base layer that does well in a resort setting where you might be idle for a few minutes (or longer) at a time. It’s breathable though, even when warm, but you will definitely get a sweat on if exerting yourself for a long time in these or if the temperature outside is above freezing.

Best Baselayer For A Solo Layer: Arc’teryx Rho SV Zip Neck

While we tend to shy away from synthetic materials due to microplastics, we have to give the Arc’teryx Rho SV a mention because it functions as a great baselayer, no doubt… but can also be used as the only layer if need be. This is great for long alpine ascents in the springtime when you’re absolutely cooking. The thicker weave allows for some wind blocking, which simply didn’t happen on any of the other base layers we tested.

So, there is definitely a time and place for synthetics. And when only wearing one layer, it’s nice to have a small pocket to hold small items like your sunglasses, sunscreen, a neck tube, or something else that may need to come and go as the sun comes out and/or retreats.

Plus, you get the added benefit of using the top for other activities such as running or hiking in colder weather, with the ability to zip down and flush some cool air throughout, especially when moving. Moisture management was fine, and there was minimal stink – especially compared to the Patagonia synthetic material. All in all, a solid (albeit expensive) choice if you don’t like the itch of wool.

How to Choose

Picking the right base layer isn’t just about grabbing the first Merino wool shirt you see (though that’s a solid start). It depends a lot on your own personal preferences, activity level, and budget. Here’s what to look for:

Material

The fabric you choose will determine how well your base layer performs in different conditions. Here are the main contenders:

• Merino Wool – Naturally breathable, moisture-wicking, and odour-resistant. It’s great for both high-output activities and cold chairlift rides. If you want a premium Merino option, Icebreaker 200 Oasis is a classic, and Smartwool Intraknit Thermal Max takes it up a notch with strategic reinforcements.
• Alpaca Wool – Less common but ultra-soft, warm, and sustainable. It has better warmth-to-weight than Merino, but it’s a bit bulkier. Arms of Andes Half Zip is a great example if you want something unique.
• Synthetic (Polyester/Blends) – Quick-drying, lightweight, and durable. These often have added tech for moisture control, like Patagonia Capilene Midweight, which uses HeiQ odour protection to combat stink. The tradeoff? Less breathability than wool, and it tends to hold onto sweat longer.
• Blends (Wool + Synthetic) – Some brands mix Merino with a touch of elastane or nylon for extra stretch and durability. If you want something with reinforced movement, Smartwool Intraknit is a great pick.

Weight & Warmth

Base layers come in different weights depending on how much insulation you need:

• Lightweight (150-200gsm) – Best for high-output activities like ski touring. These wick sweat fast but don’t add much warmth. The Icebreaker 200 Oasis is a solid example.
• Midweight (200-300gsm) – The most versatile choice for all-around resort and backcountry use. If you want warmth without bulk, Smartwool Intraknit hits a sweet spot.
• Heavyweight (300gsm and above) – For the coldest days when staying warm is the top priority. The Arms of Andes Alpaca Half Zip is an excellent choice if you want max warmth.

Fit & Mobility

A good base layer should fit snugly but not restrict movement. Here are some examples of a good fit:

• Stretch Panels & Articulation – Some base layers, like Smartwool Intraknit, have targeted reinforcements in high-movement areas.
• Seam Placement – Flatlock seams reduce chafing, which is crucial when layering under a jacket.
• One-Piece Options – If you want the ultimate in warmth and convenience (plus ninja vibes), the Airblaster Ninja Suit offers full-body coverage with a well-placed zipper for easy bathroom breaks.

Durability & Stitching

Since base layers take a beating, good construction makes a difference. You want to see:

• Flatlock Stitching – Prevents irritation and is essential for comfort.
• Reinforced Zones – Areas like elbows, knees, and shoulders tend to wear out first. The Smartwool Intraknit has extra durability in these spots.
• Odour Resistance – If you’re wearing the same layer for multiple days (hello, backcountry trips), wool naturally resists smells, while synthetics like Patagonia Capilene use antimicrobial treatments.

Moisture Management & Breathability

Sweating is inevitable, but staying wet will ruin your day. A good base layer should wick sweat away from your skin and dry quickly.

• Merino & Alpaca Wool – Naturally regulates temperature and keeps you dry even when damp.
• Synthetic Blends – Polyester dries the fastest but can feel clammy (and begin to stink really fast) if it doesn’t breathe well. Patagonia’s Capilene has improved breathability over older synthetic layers. But nobody has cracked the code compared to natural fibres. Plastic ain’t porous, no matter what you call it.

Extra Features

• Thumb Loops – Keeps sleeves from bunching up when layering. Found in some Icebreaker and Smartwool models, as well as the Ninja Suit.
• Zippered Necks – Great for ventilation. The Smartwool Intraknit Thermal Max and Arms of Andes Half Zip offer this feature.
• Hoods – Provide extra warmth and can replace a balaclava. The Airblaster Ninja Suit has one built-in.

Frequently Asked Questions

What is the best baselayer for skiing?

It depends on how hard you’re working. For cold days on the move I reach for heavier merino like the Smartwool Intraknit Thermal Max, and for high-output touring something more breathable, like the Icebreaker 200 Oasis or Mammut’s Tree Wool tights.

Is merino or synthetic better for skiing?

For me, merino or alpaca. Natural fibres breathe better and resist odour on their own, while polyester dries fast but holds onto sweat and stink and sheds microplastics. Synthetics still have a place as a solo layer, like the Arc’teryx Rho SV.

Is alpaca warmer than merino?

In my experience, a touch warmer and softer, but bulkier. That makes alpaca great for cold days and lower-output skiing, and sometimes a little too warm when I’m really pushing.

How should a ski baselayer fit?

Snug against the skin without restricting movement. A baselayer can only move sweat if it’s touching you, so skip anything baggy, and look for flatlock seams where your pack and jacket press.

Can you wear cotton as a baselayer for skiing?

Bad idea. Cotton soaks up sweat and holds it against your skin, which is exactly how you end up cold on the chairlift after a hard run.

The Final Word

A good base layer is the foundation of your layering system, and picking the right one can make or break your day on the mountain. Whether you go for a premium Merino layer like Icebreaker, an eco-friendly Alpaca option, or an ultralight synthetic like Patagonia Capilene, make sure it fits well, wicks sweat, and keeps you comfortable in all conditions.

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