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Silk thermals are a favorite among TFG readers for their ultra-lightweight, breathable insulation and luxuriously soft feel. Check out the best silk long underwear for women and snag a pair for your next chilly adventure!

Womens Silk Long Underwear to Keep Warm

If you’re gearing up for winter travel and need some cozy insulation, a good pair of thermals is a must! They’ll make all the difference when you’re spending time outdoors in cold weather.

While merino wool reigns supreme for thermal underwear, silk is a fantastic alternative. It’s the thinnest, lightest fabric for thermals, so you’ll barely notice it beneath your clothes.

Readers rave about silk long johns for so many reasons. They’re incredibly lightweight yet surprisingly durable, moisture-wicking, and quick-drying. Plus, they’re hypoallergenic and antimicrobial, meaning they won’t irritate your skin, smell, or need frequent washing—perfect for long trips!

Explore the best silk base layers for all your travel activities!

Best Silk Long Johns for Women

Shop Amazon: Top | Bottoms (Sizes XS-XL)

Voted Best Silk Thermal Underwear: Terramar Thermasilk

Terramar’s silk long underwear is a TFG favorite, with readers praising their Thermasilk Top and Bottoms. Made from 100% silk, these thermals are incredibly lightweight, allowing you to stay warm without sacrificing style or comfort. They’re snug, heat-retentive, and durable, offering great mobility without sagging.

Despite their thinness, they’re surprisingly strong and affordable for the quality. One wearer says, “Fit perfectly, kept me warm but not too warm, hand-washed easily, and dried quickly. Highly recommend for cold-climate travel!”

The Top and Bottoms come in sizes XS-XL.

See what our readers recommended as the best thermal underwear to stay warm in winter!

Shop Land’s End: Top | Bottoms (Sizes XS-XL Regular/Petite | 1X-3X Plus)

Lands End Silk Long Underwear Women’s Tops and Bottoms

Another favorite among readers is the Land’s End silk thermal underwear set, praised for its lightweight feel and super-soft texture. Their thermal top and bottoms are fitted to lock in body heat while allowing your skin to breathe, with just enough stretch to avoid any restriction. According to readers, the fit and comfort are a dream!

One reviewer shares, “I bought Lands End silk thermal long underwear for a fall trip to Iceland. Kept me warm and very comfy.”

The top comes in sizes XS-XL, petite sizes XS-XL, and plus sizes 1X-3X, while the bottoms are available in sizes XS-XL, petite XS-XL, and plus 1X-3X.

Shop Sizes XS-XL: Amazon

Grenasasilk Women’s Silk Undershirts and Bottoms

Grenasilk’s cozy silk thermals for women are perfect for any travel activity! Whether you’re sightseeing, relaxing at a campsite, or enjoying more active pursuits like hiking or skiing, this set keeps you warm (but not too hot), wicks away moisture, and allows for full mobility. The top is fitted without being skintight, so it layers easily under a light sweater, and the high-waisted pants offer a comfortable, snug fit.

One traveler shares, “These thermals kept us warm during our trip to the Arctic Circle. They’re very comfortable and not bulky.”

This silk thermal set is available in sizes XS-XL.

Shop Sizes XS-L: Amazon

Paradise Women’s Silk Long Underwear

Wearers rave about the luxurious feel of the Paradise silk base layer set for women. The pants feature a comfy waistband that sits above the hips, and the top is perfectly fitted—not too tight, but great for layering. Add this budget-friendly set to your winter packing list for warmth without the bulk!

One traveler shares, “I love this pure silk thermal set. Wore them in Paris in December, and they were perfect! They pack small, and I’ve even worn them as evening wear with a scarf and jewelry—very elegant, and no one knew they were undergarments! So versatile.”

This set comes in sizes XS-L.

Shop L.L. Bean: Top | Bottoms (Sizes XS-XL Regular/Petite | 1X-3X Plus)

L.L. Bean Pointelle Womens Silk Thermal Underwear

The pointelle knit and decorative neckline add a cute, feminine touch to these L.L. Bean silk top and bottoms. Popular with readers for their comfortable feel, weightless warmth, and wide size range, these thermals are a top choice. The high-waisted bottoms feature a comfy waistband that won’t roll down.

One TFG reader shares, “I love my L.L. Bean silk thermals. They hold their shape. I’ve had my first pair for eight years, and they’ve traveled with me to Turkey, South America, Mongolia, and many other places. They wash and dry well, too.”

The top comes in sizes XS-XL, petite XS-XL, and plus 1X-3X, while the bottoms are available in sizes XS-XL, petite XS-XL, and plus 1X-3X.

Shop Sizes S-XL: Amazon

Metway Women’s Thermal Silk Long Underwear

Metway’s women’s silk thermal underwear set offers a sleek, snug fit that won’t add bulk under your favorite outfits. The top features a deep V-neck, ensuring it stays hidden beneath your clothes, while both the top and bottoms deliver all the benefits readers love about silk—lightweight, durable, and low-maintenance. Perfect for chilly travels!

One wearer raves, “I love this product! They’re the best silk long johns I’ve ever owned. So light and invisible under clothes—you can wear them with anything.”

The set comes in sizes S-XL.

Alternatives to Ladies Silk Thermals

If you’re allergic to or sensitive to silk or merino wool—or simply prefer something else—there are plenty of great alternatives. Check out these cozy options!

Shop Sizes XXS-3X: Amazon

Thermajane Fleece-Lined Thermal Set

This cozy Thermal set from Thermajane is fleece-lined for extra warmth, but its polyester blend keeps it breathable and moisture-wicking to stay fresh and comfortable. With four-way stretch, it allows for easy movement, making it a favorite base layer for the coldest days. Plus, many wearers love that it doubles as cute activewear or loungewear!

One wearer shares, “The most comfortable and warmest thermals I’ve ever worn! They kept me warm and comfortable during my trip to Peru, even at 15,000+ feet above sea level. Softer, more comfortable, and slightly thicker than other thermals, but still lightweight!”

Available in sizes XXS-3X.

Shop Sizes 16-30 Plus: Amazon

IN’VOLAND Plus Size Thermal Set

Made from bamboo viscose, this IN’VOLAND set is airy, lightweight, and incredibly soft against the skin. Lined with micro-fleece for added warmth and insulation, the stretchy fabric allows for full mobility. Durable with strong seams, these thermals offer excellent quality at a super affordable price—perfect for many future trips!

A reviewer shares, “So soft, comfy, and warm! I LOVE this long underwear set. It’s thick (not as thick as a sweater, but more than a t-shirt), the sleeves and legs are long enough, and they’re so soft. I felt warm but not too hot. Highly recommend!”

Available in sizes 16-30 Plus.

Shop Amazon: Top | Bottoms (Sizes XS-XXL)

32 Degrees Polyester Thermal Set

32 Degrees is a reader favorite, known for their thermal tops and bottoms made from a soft, breathable polyester blend. These thermals keep you warm while being incredibly soft, moisture-wicking, anti-static, anti-odor, and stretchy. With a form-fitting design and deep scoop neck, they make the perfect base layer—some users even wear the top on its own!

One reviewer shares, “I have several in different colors. I love them for layering or wearing alone. They’re super comfortable, wrinkle-resistant, and great for travel. They also wash well and retain their color and shape!”

The top comes in sizes XS-XXL, and the bottoms are available in sizes XS-XXL as well.

Shop Sizes XS-XL: Amazon

Devops Microfleece-Lined Thermal Set

Devop’s thermal set combines polyester and spandex for added stretch, shape retention, and a close fit that traps body heat to keep you warm. Lined with micro-fleece, it provides excellent warmth, even during extended outdoor activities. Plus, it’s versatile enough for both active adventures and lounging!

One reviewer shares, “I bought these for my New York City, where it was between 30-60 degrees. They fit snugly and perfectly. The neck isn’t too high, so I could wear sweaters on top without the thermals showing. Highly recommend!”

Available in sizes XS-XL.

What do you think are the best winter silk long johns? Share and comment below!

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Best Silk Long Underwear Women’s Brands for Winter Travel