ADV SubZ Bootie 2 is a warm, waterproof and highly elastic neoprene bootie that protects your feet in cold and wet conditions. This advanced bootie is made of wind- and waterproof 3 mm neoprene with brushed inside that provides great weather protection and insulation. In addition, 4-way stretch and zipless design combine to offer a tight, aerodynamic fit. All seams are covered with waterproof tape on the inside to keep water out. Zipless design means you must put on the bootie first, before the shoe, and then pull the bootie over the shoe. 3 mm neoprene with brushed inside for optimal weather protection and warmth4-way stretch and zipless design for a snug, aerodynamic designTaped seamsReinforcements at heal and toe Velcro closure underneath the shoeReflective prints and detailsTight fit