This waterproof hybrid sandal is made to perform in adverse conditions! Features include Keen's metatomical EVA footbed, secure fitting strap design, washable polyester webbing upper, anti-microbial lining, patented toe guard, and non-marking carbon rubber outsole with multi-directional lugs for excellent traction. Available in men's full and half sizes. Runs a half size small. Most customers order up half a size.