Waterproof membrane seals out water and lets moisture escape; Waterproof coated leather and mesh upper; Bellows tongue keeps out debris; Protective and abrasion resistant rubber heel and toe cap; Breathable mesh lining; Mesh footbed cover; Cleansport NXT treated for natural odor control; COMFORTBASE removable contoured footbed cradles your foot in all day comfort; Molded nylon arch shank; Merrell Air Cushion in the heel absorbs shock and adds stability