Brand new condition Construction combines 3 mm-thick neoprene uppers with titanium adhesive throughout for increased warmth Petroleum-free Terraprene neoprene is made from limestone and recycled tires Naturally shaped toe boxes provide a roomy, nonbinding fit Reinforced toes and heels ensure long-lasting durability A hook-and-loop webbing strap across the top of each foot adjusts for a customized fit 2 mm plastic shims lend underfoot protection 3 mm patterned rubber soles provide traction