LACROSSE AEROHEAD SPORT BOOT REALTREE TIMBER 3.5MM 13 Built with AeroForm technology to deliver comfort and durability. Features a polyurethane covered neoprene core that is waterproof, lightweight, and flexible. Reinforced shin and Brush Tuff bi-directional material provide increased abrasion resistance. Active Fit adjustable neoprene gusset for easy on/off and a secure fit. Ideal for temperatures ranging from -10 to 60 degrees.