Rubber and Neoprene Imported Hand-laid premium ZXT Rubber over a 3mm neoprene core for durable, flexible, waterproof comfort Air-Circ System uses a quick-drying mesh liner to circulate air in the boot, keeping feet cooler and drier Active Fit for a secure, comfortable fit on foot Pull tab for easy on Multilayer rubber on the toe and heel plus a double-layer, ribbed vamp for added durability