Best for: Reformer Pilates socks that give you grip on the machines... Our fabric: Supersoft and breathable in a blend of bamboo and organic cotton. The recycled polyamide gives these socks durability and the stretch guarantees a comfy fit. The flexible grip spots are made from grippy bio Polytex which is 95% bio-based... .. Fabric Composition: 51% Viscose, bamboo 34% Cotton, organic 13% Polyamide, recycled 2% Elastane.. Care Instructions: MACHINE WASH @ 30