Waterproof suede leather for durability and protection; pigskin collar lining for comfort; 70% recycled polyurethane footbed with pigskin lining for support and comfort Internal EVA padding in the weight-bearing areas of welt gasket for comfort and superior flexibility; PU chamber provides comfort and support on hard surfaces and natural thermal protection in cold climates. 3mm nylon 6.6 injection molded arch shank provides support under the arch and a natural flex at the ball of the foot Vibram sole with TC4+ rubber and 4mm lugs designed for grip and durability on slick and varied surfaces; construction: board Lasted; designed to resole locally.