TCK Chevron Over the Calf Socks synthetic Shoe Size: Small - Youth 2-6, Medium - Mens 6-9 Womens 7-10 85% polypropylene, 8% nylon, 5% elastic, 2% spandex TCK proDRI insulates and manages moisture, Arch and ankle compression to reduce fatigue Infused Alphasan antimicrobials control bacteria and odor Heel/Toe construction, Double welt top for comfort and fit, Smooth toe seam adds comfort