Waterproof membrane seals out water and lets moisture escape; Waterproof nubuck and and mesh upper; Bellows tongue keeps out debris; Protective and abrasion resistant rubber heel and toe cap; External rear sling locks in the heel; Breathable mesh lining; Mesh footbed cover; NXT lined footbed cover to prevent odor; COMFORTBASE removable contoured footbed cradles your foot in all day comfort; Rock plate for protection