Abrasion-resistant form-fit 3.5mm neoprene, complete with gravel guards and a patent-pending perforated foot bed to drain away unwanted foot stew. Perfect for walk and wade trips on hot, summer days.Features Include:3.5mm neoprene upper with perforated Airprene underfoot.S (7-8), M (9-10), L (11-12), XL (13-14)Abrasion-ResistantForm FittingPerforated Foot bed