CCM Proline Bamboo Knee Skate Sock. Bamboo Rayon: Bamboo is a biodegradable, naturally anti-microbial, anti-fungal and hypoallergenic fiber Compression: 2" compression arch support provides foot fatigue relief by promoting circulation Length: Knee or calf length Material: 61 % Bamboo rayon, 25 % Rubber, 10 % Polyester, 2 % Nylon, 2 % Spandex