Please note that the number in the style name indicates denier or density of the nylon. Youll be ready to go in these wonderful, everyday Wolford Serpentes socks! Opaque, knee-high design. Materials: 81 percent nylon, 19 percent elastane. Machine wash cold, dry flat. Imported. If youre not fully satisfied with your purchase, you are welcome to return any unworn and unwashed items with tags intact and original packaging included.