100% recycled breathable mesh upper/lining, laces, and webbing Bellows tongue keeps out debris External rear sling locks in the heel Cleansport NXT(TM) 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 VibramA(R) Ecostep recycled outsole designed with 30% recycled rubber which provides added durability and improved grip on wet and dry surfaces