100% recycled breathable mesh upper, laces and webbing; Bellows tongue keeps out debris; External rear sling locks in the heel; 100% recycled breathable mesh lining; 100% recycled mesh wrapped insole; Cleansport NXT treated for natural odor control; 30% recycled integrated EVA foam insole; Merrell Barefoot 2 construction is designed to keep the foot in a natural position; FloatPro Foam midsole for lightweight comfort that lasts; Vibram Ecostep recycled outsole designed with 30% recycled rubber which provides added durability and improved grip on wet and dry surfaces