Spenco RX Orthotic Arch Supports provide firm, adjustable support to help control, stabilize and balance your foot. These Spenco RX Orthotic Arch Supports are heat moldable for a custom fit. The SpenCore layer absorbs shock while it reduces friction, improving your overall comfort. Unisex size: S (Men's 6-7, Women's 7-8), M (Men's 8-9, Women's 9-10), L (Men's 10-11, Women's 11-12), XL (Men's 12-13) or 2XL (Men's 14-15).