Silk Clothing and Undergarment Warmth Factors
WinterSilks is proud to offer the largest variety of silk and silk blend long underwear on Earth, and we’ve created our Warmth Factors to help you find your perfect level of comfort. From silk’s natural ability to insulate while wicking away moisture to its luxuriously comfortable feel, you won’t find a better fabric for layers or undergarments. And, not only are most of our exclusive silk long johns machine washable, they come in tall, petite, and plus sizes, as well as 5 Warmth Factor weights so you can mix and match to craft the perfect long underwear set for your needs. Consult our extended Warmth Factor guide below to customize your layer of silk comfort.
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 Warmth Factor 1: Our lightweight silk long underwear
and layers are perfect for year-round indoor/outdoor use,
keeping you warmer outside while still cool indoors.
They also provide invisible all-natural protection against
skin-irritating synthetic outerwear.
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 Warmth Factor 2: Wear our Factor 2 pure silk, silk blend,
and ribbed long johns indoors in chilly offices, supermarkets, and
air-conditioned events during the summer months, while enjoying
their easy insulating power outdoors for higher exertion
activities in cool to cold weather.
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 Warmth Factor 3: Versatile mid-weight warmth in
pure filament silk and spunsilk allows you to turn the
thermostat down in the fall & winter to save on
energy costs, and they’ll keep you toasty and dry
when participating in moderate exertion activities
in cold weather.
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 Warmth Factor 4: A display of our natural fiber expertise,
our Factor 4 silk and silk blends are the most comfortable
long underwear you’ll find. Wear these richly soft,
incredibly warm layers alone for lounging and as outdoor
long johns when temperatures drop.
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 Warmth Factor 5: Our very warmest pure silk long underwear
and innovative technical blends, these heavyweight pieces will
protect you from the coldest weather winter throws your way.
They also can be worn alone as cozy sleepwear or
for lounging around the ski lodge.
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