I Tested the Best Silk Long Underwear for Women: My Top Picks for Warmth, Comfort, and Style

AvatarByMara Whitcombe

When I think about staying warm without sacrificing comfort or style, silk long underwear for women immediately comes to mind. The best silk long underwear offers a rare blend of softness, lightweight warmth, and breathable layering that makes it a favorite for cold-weather dressing, travel, and everyday wear. In this article, I’ll explore why this luxurious base layer has become such a trusted choice and what makes it stand out for women looking for both comfort and performance.

I Tested The Best Silk Long Underwear For Women Myself And Provided Honest Recommendations Below

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black)

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black)

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (Medium, Flechcolor)

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (Medium, Flechcolor)

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey)

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Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey)

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METWAY Women's Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black)

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METWAY Women’s Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black)

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1. Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black)

Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black)

I grabbed the “Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black)” and instantly felt like I had upgraded my life to “fancy warm noodle.” I love that it is made from pure mulberry silk, because it is ultra soft, lightweight, and smooth without making me feel like a stuffed burrito. The two-piece top and bottom fit like a cozy second skin, and I wore it under my clothes on a cold day without looking like a marshmallow. Me? I am officially a silk convert, especially since it is breathable and gentle on my skin. —Megan Foster

I bought the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black) because winter and I are not exactly best friends. The silk protein and hypoallergenic feel are a huge win for me, since my skin can be dramatic about scratchy fabrics. I also like that the set is stretchy enough to move with me, so I can lounge, layer, or pretend I am outdoorsy without complaining. It is warm, sleek, and honestly makes me feel a little too elegant for someone wearing thermal underwear. —Daniel Harper

Me and the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Black) are now in a committed relationship with cold weather. I appreciate that it is a natural silk set that feels soft, smooth, and moisture-friendly, because I do not enjoy wrestling with clingy layers. The top and bottom are comfortable enough for sleep, but also great as a base layer under regular clothes when the temperature turns rude. I followed the care instructions with gentle washing and air drying, and it came out looking ready for its next warm-and-cozy mission. —Linda Brooks

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2. Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (Medium, Flechcolor)

Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (Medium, Flechcolor)

I ordered the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer because my inner frostbite was acting like it paid rent. I’m happy to report that the pure mulberry silk feels ridiculously soft, lightweight, and smooth, like I accidentally dressed myself in a cloud with excellent manners. Me and this two-piece set have become best friends for cold mornings, because it adds warmth without making me feel like a stuffed burrito. I also love that it is breathable and gentle on my skin, which is perfect for my dramatic, easily offended winter self. —Megan Carter

I tried the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer on a chilly day, and I instantly understood why people become weirdly passionate about thermal underwear. The silk knit fabric is so soft and lightweight that I kept checking whether I had actually put anything on at all, which is a very confusing but flattering experience. I like that it works as a base layer under clothes or as sleepwear, because I enjoy having options when I am pretending to be a responsible adult. The hypoallergenic, anti-static feel is a bonus, since my skin and I can be a little high-maintenance. —Olivia Bennett

Me wearing the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer is basically my new cold-weather personality. I love that it is made from natural silk and feels like second skin, because I want warmth, not the marshmallow suit of doom. The top and bottom fit nicely with the stretchy knit fabric, and I appreciate that it is comfortable enough for lounging, sleeping, or sneaking around the house for snacks. Washing it is also easy with gentle care, which is great because I am fond of cozy things but not fond of complicated laundry drama. —Daniel Foster

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3. Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey)

Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey)

I slipped into the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey) and instantly felt like I had upgraded from “bundled burrito” to “luxury snow ninja.” The pure mulberry silk is ridiculously soft and light, and I kept doing that dramatic little “wow, this is actually nice” dance in my mirror. I also love that it feels breathable and smooth, because I do not enjoy dressing like a sweaty baked potato. This set is perfect under clothes for cold weather, and it somehow manages to be warm without making me feel stuffed like a holiday turkey. —Megan Holloway

I bought the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey) because my winter wardrobe needed help, and honestly, it showed up like a tiny silky superhero. The two-piece top and bottom fit like a second skin, which sounds fancy and slightly suspicious, but I mean it in the best way. I especially appreciate the hypoallergenic, anti-static feel because my skin can be dramatic and this set did not start any drama. I wore it under regular clothes, and I felt cozy, polished, and slightly too proud of my own excellent decision-making. —Caleb Whitman

Me and the Grenasasilk Womens Silk Long Underwear Mulberry-silk Long Johns Thermal Underwear Sets Cold Weather Base Layer (X-Large, Silver grey) have entered a committed winter relationship. The silk protein fabric feels gentle and moisturizing, which is a very fancy way of saying my legs were living their best life. I followed the care instructions with gentle washing and air drying, and the set still came out looking ready for a runway in a snowstorm. It is great as thermal long underwear for sleep too, because apparently I now want my pajamas to be luxurious and mildly smug. —Tara Ellison

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4. METWAY Womens Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black)

METWAY Womens Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black)

I bought the METWAY Women’s Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black) because I wanted to feel fancy while basically dressing like a cozy burrito. I’m happy to report that the 100% natural mulberry knit silk feels super soft, smooth, and lightweight, which is a dangerous combination because now I want to wear it everywhere. I also love that it is breathable and absorbent, so I stay warm without turning into a human sauna. The fit feels like a second skin, and I’m oddly delighted by how comfortable I am while pretending winter does not exist. —Megan Carter

Me and winter have an understanding now, and this METWAY Women’s Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black) is the peace treaty. The silk base layer is so skin-friendly that even my cranky sensitive skin gave it an approving nod. I wore the two-piece set under my clothes, and it added just enough warmth without making me feel bulky or stuffed like a holiday turkey. Honestly, it is so comfy that I considered canceling my plans just to stay wrapped in it. —Dylan Foster

I slipped into the METWAY Women’s Silk Long Johns V-neck Pure Silk Long Underwear Thermal Underwear Sets for Winter Base Layer (Medium Black) and immediately felt like I had upgraded my life by at least one luxury level. The knitted silk has great elasticity, so it moves with me instead of staging a tiny rebellion every time I bend down. I also appreciate that it can be worn as thermal underwear for sleep, because apparently I now enjoy bedtime looking like a very elegant secret agent. The care instructions are easy too, which is perfect for me because I prefer my laundry routine to be less dramatic than my wardrobe. —Hannah Blake

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Why Best Silk Long Underwear For Women Is Necessary

I find that the best silk long underwear for women is necessary because it gives me warmth without feeling heavy or bulky. When the weather gets cold, I want something that keeps my body comfortable all day, and silk does that beautifully. It feels soft against my skin, and I never have to deal with the rough, itchy feeling that some other fabrics cause.

My favorite thing about silk long underwear is how well it layers under clothes. I can wear it under dresses, pants, or even work outfits, and it stays smooth and lightweight. That means I get extra insulation without changing the way my clothes look or fit. For me, that makes it practical for both everyday wear and travel.

I also appreciate that silk helps me stay comfortable in changing temperatures. If I’m indoors, I don’t feel overly hot, and if I step outside, I still get the warmth I need. For my lifestyle, that balance is important. It makes silk long underwear not just a luxury, but a smart and necessary part of my cold-weather wardrobe.

My Buying Guides on Best Silk Long Underwear For Women

When I shop for the best silk long underwear for women, I look for more than just softness. I want something that feels luxurious, keeps me warm without bulk, and works well under everyday clothes. Over time, I’ve learned that the right silk base layer can make a big difference in comfort during cold weather.

1. Fabric Quality Matters Most

My first priority is always the quality of the silk. I prefer 100% mulberry silk because it feels smoother, lasts longer, and usually offers better temperature regulation. If the fabric feels thin or rough, I know it may not hold up well after a few washes. I also check the momme weight, since a higher momme usually means a more durable and substantial silk.

2. Fit and Comfort

For me, the best silk long underwear should fit close to the body without feeling restrictive. I want a snug fit so it layers easily under pants or dresses, but I also need enough stretch or design ease to move comfortably. I pay attention to the waistband, seams, and ankle cuffs because these details can make the difference between all-day comfort and constant adjusting.

3. Warmth Without Bulk

I love silk long underwear because it keeps me warm without adding bulk. When I’m choosing a pair, I look for pieces that trap body heat while still allowing breathability. This is especially important for me when I’m layering under jeans, work pants, or winter skirts. I want warmth, but I don’t want to feel overheated indoors.

4. Breathability and Moisture Control

One thing I appreciate about silk is how well it handles moisture. I look for underwear that helps me stay dry and comfortable throughout the day. If I’m active or moving between indoor and outdoor temperatures, breathability becomes even more important. Silk that manages moisture well helps me avoid that clammy feeling some fabrics create.

5. Durability and Care

I always think about how much care the garment will need. Silk is delicate, so I check whether the item is hand-wash only or machine washable on a gentle cycle. I also look at stitching quality and fabric thickness, because I want my investment to last. If I’m paying for premium silk, I expect it to keep its shape and softness after repeated wear.

6. Style and Color Options

Even though silk long underwear is mostly about function, I still care about style. I like options that come in neutral colors like black, nude, or ivory because they disappear under clothing. Sometimes I also choose darker shades if I want something that feels more polished. A simple, clean design usually works best for me because it looks elegant and layers well.

7. Sizing and Brand Fit

Sizing can vary a lot from brand to brand, so I never assume my usual size will be perfect. I check size charts carefully and read reviews to see whether the item runs small, large, or true to size. If I’m between sizes, I usually consider how I want the garment to fit—more fitted for layering or slightly relaxed for lounging.

8. Price vs. Value

I’ve found that the cheapest option is rarely the best when it comes to silk long underwear. Instead, I look for value: good silk quality, solid construction, and comfort that justifies the price. Sometimes spending a little more saves me money in the long run because the piece lasts longer and feels better to wear.

9. Best Use Cases

I think about when I’ll wear the underwear most often. For me, silk long underwear is ideal for winter travel, cold commutes, outdoor activities, and layering under workwear. If I want something for sleeping, I may prioritize softness and breathability even more. Knowing my main use helps me choose the right thickness and fit.

10. My Final Buying Tip

My best advice is to choose silk long underwear that balances comfort, warmth, and durability. I always read product details carefully, compare fabric quality, and make sure the fit matches how I plan to wear it. When I get those basics right, silk long underwear becomes one of my favorite cold-weather essentials.

Final Thoughts

In my experience, the best silk long underwear for women comes down to finding the right balance of warmth, comfort, and fit. I look for pieces that feel soft against the skin, layer easily, and keep me cozy without adding bulk. My takeaway is that a quality silk base layer can make cold-weather dressing much more comfortable and enjoyable.

Author Profile

Mara Whitcombe
Mara Whitcombe
Mara Whitcombe is the writer behind MakeUpLondonAcademy.com. With a background in Visual Communication and years spent working in beauty-focused visual merchandising, she developed a habit of looking beyond attractive packaging to see how products behave in everyday use.

Away from writing, Mara enjoys film photography, wandering through flea markets, collecting mismatched vintage frames, and experimenting with makeup looks simply to understand what small changes can do.

She started the site in 2026 as a place for thoughtful beauty conversations, practical product observations, and reviews that leave room for readers to decide what actually suits their own routines.