This knee-high length sock comes in great colors and is perfect under casual or dress pants. Product Features: Knee length Smooth flat knit Solid: 36% Cotton, 36% rayon from bamboo, 26% nylon and 2% spandex Heather: 78% Cotton, 19% Nylon and 2% spandex Tweed: 73% acrylic, 21% nylon, 4% polyester and 2% spandex Black Tweeds: 62% acrylic, 21% nylon, 15% cotton and 2% spandex