Quickdry 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 hookandloop 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 designed to stabilize and support your foot on uneven terrain Rugged Spider Rubber outsole is extremely durable and supplies great traction