Design: Merrell(R) Barefoot 2 construction is designed to keep the foot in a natural position 100% recycled breathable mesh upper 100% recycled laces and webbing Bellows tongue comfortably protects the foot from debris External rear sling locks in the heel In-Shoe Comfort: 100% recycled breathable mesh lining 100% recycled mesh wrapped insole 30% recycled integrated EVA foam insole Durability & Traction: Vibram® Ecostep recycled outsole designed with 30% recycled rubber which provides added durability and improved grip on wet and dry surfaces Additional Details: Cleansport NXT(TM) treated for natural odor control Sizing Note: It is recommended that you order a 1/2 size smaller than your typical Merrell(R) size Weight (per shoe): 5.29oz Lug: 2mm Stack Height: 6mm Drop: 0mm