Lucky Couple&reg; Men&rsquo;s Top&Bottom in One Set Crewneck Midweight Slim Fit Wicking 94.9% modal/5.1% spandex Imported Machine washable and dryable. Better to machine wash cold and tumble dry low. Used only non-chlorine bleach when needed. No fabric softener. Do not iron. Material: 94.9% modal + 5.1% spandex. Base-layer-underwear closure. Thermal long john including ankle length and leggings. Multiple choices in colors and sizes. Ultra warm, comfortable and low-impact activities. This underwear is so soft and smooth that you can found it will not become the burden of your body in cold season. Since they are made of elastic fiber including elastic waistband, our crewneck top and low-rise bottom are able to be 360 stretched for maximum flexibility and optimum fit. This skinny, solid and slim fit one-set-underwear shows your stronger body and retains body heat. Rib cuff and neckline for secure fit. Flat lock seams to prevent chafing and irritation. Excellent moisture control, such as wicking away sweat, quick drying and odor resistant. Great to wear it alone at home or add an extra layer of warmth under your clothes. In addition to specifically for warmth in super cold Winter, it is available to be worn in Spring and Autumn.