US Sizing: Small: Women&';s 5-7.5 Medium: Women&';s 8-10.5, Men&';s 6-8.5 Large: Women&';s 11-13.5, Men&';s 9-13 Extra Large: Men&';s 14-16 This 6" mini crew trail sock keeps feet dry, supported, and friction-free on rugged terrain. We love it for: trail runnings & racing Fabric: 72% polyester, 23% nylon, 5% elastane 6" mini crew height to help block trail debris Breathable mesh zones in foot and ankle Targeted arch compression for midfoot support Seamless toe and heel to reduce friction Moisture-wicking yarns help prevent blisters Anatomical left/right foot design for a more natural, stay-put fit