Best for: Reformer Pilates socks that give you grip on the machines.. The features: Quarter length socks that come up to your calf. These socks have grip spots on the sole so they don't slip on the machines in Reformer Pilates. Finished with a sporty double stripe at the top of the socks.. 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... 48% Bamboo Viscose, 32% Organic Cotton, 18% Recycled Polyamide, 2% Elastane. Grips spots on the sole. Easy care - wash at 30°