Castelli tempesta shoecoverintroducing the first bootie to feature outdry technology weve vacuum bonded a seamless membrane to the outer shell to make sure nothing can come in weve built in a neoprene cuff to seal around your ankle and added a waterproof zipper features 4 way stretch water repellent nylon outer shell absolutely waterproof outdry technology membraneultralight waterproof zipperneoprene cuff for easy onoff and secure fit around the ankle open bottom to work with all types o