Acerbis Impact Sock features: Reinforcements around the shin and ankle. Fabrics designed to regulate body temperature and dissipate moisture easily. Breathable inserts on the instep. Reinforcements on the toe and heel. Flat seam at the toe line. Impact Sock materials: 85% Polyamide Meryl Skinlife. 10% Polypropylene Dryarn. 5% Spandex. Available in various sizes and colors. S/M (39-41) L/XL (42-44) XXL(45-47)