Quick-dry webbing made from recycled plastic using traceable, verifiable REPREVE polyester yarn by Unifi supports your foot and stands up to abuse Lined with lightweight, breathable, and 60% recycled polyester mesh that keeps your feet cool and comfortable Easy hook-and-loop closure comes on and off quickly and gets the fit just right Molded PU midsole cushions and supports mile after mile, even with a heavy pack, Nylon shank stabilizes and supports your foot on uneven terrain Rugged Spider Rubber outsole is extremely durable and supplies great traction Treated with Life Natural, a peppermint-based anti odor treatment Sustainability Initiative(s): Vegan, Webbing made from recycled plastic using traceable, verifiable REPREVE polyester yarn by Unifi Best for: multi-day hikes Half pair weight for size W7,M9,I2/3,T4,K13,Y4: 11.0oz RN 88276 .