■ Material: 70% Polypropylene, 21% Nylon, 5% Lycra, 4% X-Static Made in Italy. ● Ultra-thin ski socks like a stocking, giving you the unwavering hold that experts demand. The X-Static coating of sterling silver is used on the bottom of the foot.Thin, yet incredibly warm. Also available in XS sizes for women with small feet to fit 8.5 inches (21.5 cm). ■ X-Static is a high-performance fiber that is coated with sterling silver over nylon thread. ■ This is a high performance fiber born in the United States that features super elastic developed by Lycra Invista. ■ Mikotex soft and lightweight polypropylene thread with a double structure that changes the weave of the yarn on the front and back.The material is comfortable and features a comfortable feel and fit that is breathable without heat escape. ■ FLAT SEAM MICOs special technology to make the seams flat at the end of the knob.