Home Underwear 13 of the best thermal underwear of 2021

13 of the best thermal underwear of 2021


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It’s never too early to stock up on your cold weather essentials. Along with cozy flannel pajamas and a down jacket (or down alternative), you won’t regret adding a good pair of thermal underwear to your winter shopping list. When the air cools and the snow begins to fall, the right base layers can keep you comfortable in all conditions.

Before you buy, be aware that not all thermal underwear sets are created the same. While you can find affordable options at most major retailers, the right materials and design can make all the difference. Your base layers should retain body heat without itching, scratching, or sweating. Look for thermal clothing that uses temperature-regulating fabrics, like wool and spandex, to stay warm without overdoing it.

Also keep an eye on the design. Most thermal underwear serves as a base layer under other clothing – you want tops and bottoms with clean, tight figures, but they’re not so restrictive that they become uncomfortable. Keep scrolling to shop for 13 of the best thermal underwear from brands like SmartWool, Ibex and more.

13 of the best thermal underwear to layer this winter

The best thermal underwear for women

Smartwool, Women’s Merino 250 Base Layer Stockings – $ 100.00

Smartwool is a smart investment. Like all Smartwool products, these leggings (or thermal underwear) are made from merino wool which is known to be moisture wicking, antimicrobial and super comfortable. Available in black, navy blue and various mottled options.

What the critics are saying: As soon as you remove those base layers from the packaging, you know you are dealing with a quality product. I work for a hardware retailer so I’ve been fortunate enough to manage a lot of base layers and these are by far my favorites. – Smartwool client

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Ibex, Woolies technical base layer for women – $ 115.00

Likewise, Ibex also manufactures premium products, all made from high quality merino wool. This best-selling thermal underwear is warm without ever feeling stuffy or sweaty. Slip them on under snow clothes, jeans, leggings, whatever you need to layer them.

What the critics say: “Great for keeping warm indoors during winter and a great base layer. These natural fibers do not retain odors like synthetic fibers. Always a great addition to a wardrobe. – Taunya M., ibex client

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Thermajane, Women’s Ultra Soft Thermal Underwear Set – $ 30.00

For just $ 30, grab this best-selling thermal underwear on Amazon and stay warm all winter long. Instead of wool, they’re made from a lightweight poly-elastane blend that’s still warm enough to keep body heat in its place. They are also fleece lined for extra warmth.

What the critics are saying:I bought a set of these thermals in each color for my trip to Alaska over the Thanksgiving vacation… At -14 degrees, they kept me warm and they are super soft and comfortable. – Amazon customer

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Patagonia, Women’s Capilene Thermal Weight Stockings – $ 90.00

Breathable but still tightly knit, these thermal socks from Patagonia are made from spandex for better movement and flexibility. Between the flat seams, stretch waistband, and supple fabric, they’re comfortable and get the job done when the temperature drops.

What the critics say: “I just bought my third pair. They are lightweight but offer great warmth in cold weather. I spend a lot of time hiking, snowshoeing and cross country skiing. – Irene, Patagonia customer

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Stoic, Women’s Merino Boy Boxer Brief – $ 37.00

When you want warmth without the bulk, pull on this Merino wool boxer brief from Stoic. Flat, stretch seams will never dig or chafe. Great for cold weather workouts and gym sessions when shorts alone aren’t enough. Available in black and gray.

What the critics are saying: “These are the perfect absorbent underwear for hiking and camping. This is the second time that I have bought them. – Amazon customer

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Sweaty Betty, Betty Ski Merino Wool Base Layer Leggings – $ 70.00

Arguably the nicest thermal underwear on this list, these thermal leggings from Sweat Betty are just as functional as they are fashionable. They’re seamless and sweat-resistant, made from dreamy merino wool that will keep you warm on the slopes and beyond. Available in black and white.

What the critics are saying: “These leggings are beautiful. The merino fabric is amazing. I have a few pairs of Sweaty Betty underwear that I wear as winter running tights. They’re perfect. ”- Betty’s Sweaty Client

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Terramar, Women’s Thermasilk Pointelle Pant – $ 50.00

These thermal stockings are made from 100 percent silk filaments that fit perfectly under any type of outerwear. They’re also temperature-regulating, so you’ll never overheat, and UPF 50 for extra protection. Available in black, gray, white and pink.

What the critics are saying: I use this and a matching top for sleeping when hiking the backcountry. Warm or cool, they’re great for staying comfortable at night. – Amazon customer

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The best thermal underwear for men

Icebreaker, Men’s 175 Merino Everyday Thermal Leggings – $ 85.00

Icebreaker is another premium supplier of all things thermal. Its line of merino wool base layers are versatile and reliable, guaranteed to do its job no matter where you go.

What the critics are saying: “It was everything I expected and I’m so glad I bought two pairs! Perfect winter gear for living in the cold city or hiking in the high countries. – Icebreaker client

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Kora, Yushu socks for men – $ 130.00

Kora products are made from merino and yak wool, making them ridiculously warm even in the coldest climates. These long pants fit snugly under bibs, snow pants and more, making them perfect for just about any winter activity.

What the critics are saying: “This is the second item we are testing at Kora and we are impressed. If you appreciate natural materials and want a high performance underwear, go for yak wool! – Review of engagement

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Under Armor, Men’s ColdGear® Base 3.0 Leggings – $ 70.00

This all-season base layer is ideal for everyday wear, inside and outside the gym. The brushed grid interior traps air, maintaining a consistent (but warm) body temperature as you sweat. Great for adding heat but never loose.

What the critics are saying: “As my passion always takes me outdoors, winter is my favorite time of year. The cold base coat has never disappointed me. It’s fantastic in cold weather, whether I’m skiing, snowshoeing or even snowmobiling. – Under Armor client

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At The Buzzer, Men’s Thermal Underwear Set – $ 17.00

This Best Selling Thermal Underwear Set Has Over 5,000 Reviews On Amazon and is less than $ 20. It is made from a cotton-poly blend which is comfortable but never stiff or uncomfortable. An excellent economical option for quality thermals.

What the critics are saying:I love these thermals. Excellent quality for the price and I like the vitality of the red even after several washes. Keeps me perfectly warm in a New York winter without being too heavy and uncomfortable when transitioning from outside to inside. – Amazon customer

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Tani, Men’s SilkCut Thermal Underwear Set – $ 145.00

This luxurious thermal set is made from all natural biodegradable materials, making it the most eco-friendly option on this list. The top and bottom are soft and stretchy, made of a fine yet durable fabric designed to keep you warm while you’re wearing it.

What the critics are saying:Exceptional in terms of feel, quality and warmth! I hate having to take them off! – Kip H., Tani client

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Thermajohn, Men’s Ultra Soft Long Johns Set – $ 35.00

Top-selling men’s thermals are just $ 35, affordable enough to snag a set in any color. The poly-spandex blend wicks away moisture and sweat, keeping you dry and cool on the go.

What the critics are saying:These long boxers are quite thin, very comfortable and well adjusted around the wrists, ankles and waist. Wearing them under everyday clothes in winter is very convenient. – Amazon customer

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