Made of custom-stretch Lycra with a super soft microfiber lining, so unlike adhesive products, they stick to your skin wet or dry for all day protection. Approximately one millimeter thick, takes up minimal space in shoes. These are so soft and supple they will feel like a second skin on your feet. Great for sports with demanding lateral movement such as tennis, dancing and basketball. Color: Grey SIZE GUIDE: Small fits Kid's 1-4 Medium fits Women's 5-9, Men's 4-8 Large fits Men's 9-12