Ideal for days when waders aren&';t necessary, the Guide Guard socks provide comfort and warmth inside of Simms wading boots Constructed using 3.5mm abrasion-resistant neoprene in the upper and gravel guard, and perforated 3.5mm neoprene underfoot for drainage Anatomically correct left and right patterning for superb fit and easy don/doff Fold down gravel guard includes boot hook for security 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: 3.5mm neoprene ITEM #: PG-13503