With a low-profile design and contoured anatomical fit, Simms Neoprene Wading Socks keep active feet comfy and debris-free when wet wading. Constructed using 2.5mm abrasion-resistant neoprene in the upper, and perforated 2.5mm neoprene underfoot for drainage Anatomically correct left and right patterning for superb fit and easy don/doff Unisex sizing: XS (M&';s 4-5, W&';s 6-7) S (M&';s 6-7, W&';s 8-9) M (M&';s 8-9, W&';s 10-11) L (M&';s 10-11, W&';s 12-13) XL (M&';s 12+) FABRIC TECH: 2.5mm neoprene