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Silk thermals are loved by TFG readers for their incredibly lightweight, breathable insulation, and deliciously soft feel. Take a look at the best silk long underwear for women, and grab a pair for your next chilly trip!

Womens Silk Long Underwear to Keep Warm

If you’re getting ready for your winter travels and need some cozy insulation, you’ll definitely want a pair of thermals! They’ll make all the difference when spending time outdoors in cold weather.

While merino wool is queen when it comes to thermal underwear, silk is another wonderful alternative. It’s the thinnest and most lightweight thermal fabric, so you’ll barely feel them underneath your clothes.

Readers love silk longjohns for so many reasons. They’re very light yet incredibly durable, as well as moisture-wicking and quick-drying. Because they’re hypoallergenic and antimicrobial, they won’t be itchy or irritating to your skin, won’t smell, and can be worn over and over throughout your travels!

Check out the best silk base layer options for all kinds of travel activities!

Best Silk Long Johns for Women

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

Voted Best Silk Thermal Underwear: Terramar Thermasilk

Terramar makes silk long underwear women absolutely love. TFGs rave about their Thermasilk top and bottoms. They’re always a top seller on the blog, and readers couldn’t get enough of them during past Amazon Prime Day sales!

They’re made from 100% silk and are so lightweight that they can be worn under virtually any clothing, allowing you to show off your style without sacrificing warmth and comfort! Snug against your body, they’ll retain body heat amazingly well, keeping you warm in the coldest of temps, and aren’t constricting at all.

And despite being thin and light, this ladies thermal silk underwear is incredibly strong and durable. They’re stretchy and offer great mobility but will hold their shape and won’t sag. For their amazing quality, readers agree that they’re super affordable, too.

A wearer says, “Fit perfectly, kept me warm but not too warm, hand washed easily, and dried quickly. Excellent purchase. Would recommend it for any cold climate travelers!” The top comes in sizes XS-XL, and the bottom comes in sizes XS-XL, too.

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

Shop Sizes XS-XL: Amazon

Grenasasilk Women’s Silk Undershirts and Bottoms

These cozy silk thermals women’s style from Grenasilk have you covered for whatever travel activities you have planned! Whether you’re sightseeing, relaxing at a campsite, or doing something more active like hiking or skiing, this set will keep you warm (but not too hot), wick away sweat, and allow you to move freely. The top is fitted but not skintight, so it won’t bulk up if you wear it under a light sweater, and it can be tucked into the pants, which have a comfy, high-waisted fit.

A traveler reports, “These thermals kept us warm during our trip to the Arctic Circle. They are very comfortable and not bulky.” This silk thermals womens set comes in sizes XS-XL.

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 popular choice with readers is the Land’s End silk thermal underwear womens top and bottoms, light enough for layering and super soft to the touch. These thermals are fitted so they lock in your body heat really well but allow your skin to breathe, and they have enough stretch so you won’t feel restricted. And according to readers, the fit and feel are a dream!

A reader says, “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, and the bottoms come in sizes XS-XL, petite XS-XL, and plus 1X-3X.

Shop Sizes XS-L: Amazon

Paradise Women’s Silk Long Underwear

Wearers rave about the luxurious feel of this Paradise silk base layer women’s set. The pants have a small and comfy waistband that sits above the hips, and the top isn’t too tight yet layers well. Add this budget-friendly set to your winter packing list for ample warmth minus the bulk!

A traveler gives an impressive review, “I love this pure silk underwear thermal set. Wore them in Paris in December, and they were great! They take up little room in my suitcase. I’ve also worn them as evening wear with a pretty scarf and jewelry. Very elegant, and no one suspected they were undergarments! Very versatile.” This set comes in sizes XS-L.

We’ve prepared a list of the best travel underwear for women. We know you’ll find the perfect pair for your next trip!

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 adds a cute, feminine touch to these L.L. Bean silk long johns ladies top and bottoms. These are super popular with readers thanks to their comfortable feel, weightless warmth, and wide size range. The bottoms are high-waisted, with a comfy waistband that won’t roll down.

A 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 been to Turkey, South America, Mongolia, and lots of other places with me. They wash and dry well, too.”

The top is available in sizes XS-XL, petite XS-XL, and plus 1X-3X, and the bottoms come in sizes XS-XL, petite XS-XL, and plus 1X-3X.

Check out the best packable and beautiful cardigan sweaters that you’ll want for your next trip!

Shop Sizes S-XL: Amazon

Metway Women’s Thermal Silk Long Underwear

Metway’s womens silk thermal underwear set can be worn under your favorite outfits without any bulk, as it’s snug and super comfortable with a sleek fit. The top has a deep v-neck, so it won’t peak through your tops, and both top and bottoms offer the amazing benefits readers love silk for! Low maintenance yet durable, this s a winner for your chilly travels.

A wearer gushes, “I love this product! They are the best silk long johns that I’ve ever owned. They are so light and invisible under one’s clothes that you can wear them under anything.”

The set comes in sizes S-XL.

Alternatives to Ladies Silk Thermals

If you have allergies or skin sensitivities to silk or merino wool, or they just aren’t your preference, there are lots of other fantastic alternatives. Check out these cozy options!

Shop Sizes XXS-3X: Amazon

Thermajane Fleece-Lined Thermal Set

This dreamy thermal set from Thermajane is fleece-lined for extra warmth and coziness, but the polyester blend keeps it breathable and moisture-wicking to keep things fresh and comfy. It has four-way stretch so you can move freely, and tons of wearers say they make the perfect base layer for the coldest of days! Wearers especially love that they can be worn on their own as cute activewear or a loungewear outfit!

One wearer says, “The most comfortable and warmest thermals I have ever worn!! They kept me warm and comfortable on my recent trip to Peru as we traveled up the mountains at 15,000+ feet above sea level. Much softer, more comfortable, and slightly thicker than other thermals but very lightweight!” Available in sizes XXS-3X.

Find out what clothing tips our readers recommend to avoid overheating in cold weather!

Shop Sizes 16-30 Plus: Amazon

IN’VOLAND Plus Size Thermal Set

Made of bamboo viscose, this IN’VOLAND set is airy, light, and feels lovely against the skin. They’re lined with micro-fleece, giving warmth and insulation, and the stretchy fabric allows complete freedom of movement. Its durable fabric with strong seams makes them a high-quality pair (at a super affordable price!) that’ll last for many trips to come!

A reviewer reports, “So soft, so comfy, and warm! I LOVE this long underwear set. They’re nice and thick (less than a sweater but more than a t-shirt), the sleeves and legs are long enough for me, and they’re so soft. I felt warm but not overly hot. Highly recommend!” Sizes range from 16-30 Plus.

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

32 Degrees Polyester Thermal Set

32 Degrees is highly popular with readers, and they make awesome thermal tops and bottoms made from a soft and breathable polyester blend. Aside from keeping you warm as can be, they’re amazingly soft, moisture-wicking, anti-static, anti-odor, and stretchy, too! Form-fitting with a deep scoop neck, they’re the perfect base layer, and some users say they can wear the top on its own, too!

One review says, “I have several of these in different colors. I love them for layering or even wearing alone. They’re very comfortable and great for travel as they don’t wrinkle. They also wash well and retain their color and shape!”

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

For a trip to an extremely cold destination, read our post on what clothing to wear in the arctic!

Shop Sizes XS-XL: Amazon

Devops Microfleece-Lined Thermal Set

Devop’s thermal set blends polyester with spandex for extra stretch, shape retention, and a close fit that’ll retain body heat and keep you warm. It’s micro-fleece lined and will add great warmth, even when you’re out in the cold for long periods of time. Plus, it’s super versatile and can be worn for both active excursions and lounging!

“I bought these for my New York City trip, where it was between 30-60 degrees. These fit snugly and perfectly. The neck is not too high, so I could wear sweaters on top, and my thermals did not show. I highly recommend this!” Sizes go from XS-XL.

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

For more winter travel clothing tips, please read:

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Best Silk Long Underwear Women’s Brands for Winter Travel