Crackshot Snake Guardz is the original ultra-lightweight snake gaiter, with metatarsal protection. A unique design of these snake bite protecting leg gaiters allows air circulation between the leg of the wearer and the Snake Guardz. All fabrics have water-repellant coatings so fang venom does not soak into the material. Solid colors meet the California Technical Bulletin #117, Section E, CS-191-53 flame-retardant specifications. For proper sizing, measure the circumference at the largest part of calf: - Small: 6"" to 9"" - Medium: 9"" to 14"" - calf circumference< - Large: 14"" to 18"" - calf circumference - X-Large: 18"" to 23"" - calf circumference - XX-Large: 23"" to 30"" - calf circumference - XXX-Large: 30"" to 36"" - calf circumference