Ultimate Liner Lightweight Over-the-Calf Liner Sock Material: 77% Polypropylene, 17% Nylon, 3% Elastic, 3% Lycra Fits men's shoe sizes: Medium(5-8), Large(9-12), X-Large(13-15) Fits women's shoe sizes: Small(4-7), Medium(8-9), Large(10-11) Over-the-calf lightweight sock Reinforced toes and heel pads increase durability and reduce foot fatigue