Fashion Silk Women's Thermal Underwear Sets Knit Silk Long Johns For Women Base Layering Sets Silk,100% natural mulberry,pure protein fiber. 2 Pieces Thermal Set (Top & Bottom) Ultra soft,breathable,absorption and Comfortable,Silk fabric is beneficial to the skin healthy. To ensure comfortable fit,please be sure to refer to the Update size (Oct.)details(in Product Description) Recommend hand washing ,neutral detergent, low temperature drying or shade drying to avoid direct sunlight