CONSCIOUSLY CREATED: Environmentally Preferred Leather; Tanning leather is a dirty process; That’s why KEEN sources hides from Leather Working Group certified tanneries that use processes to reduce chemical use and the impact on watershed WATERPROOF: KEEN.DRY waterproof breathable membrane keeps your feet dry and comfortable all day long by allowing vapor out without letting water in; Environmentally preferred durable water repellent DWR helps prevent leather from drying out COMFORT: Waterproof, nubuck leather upper for comfort; Compression molded underfoot cushioning provides excellent arch support while the wool felt lining keeps your feet cozy on cold nights INSULATION: KEEN.WARM 200G insulation helps keep feet warm in temperatures down to -25° F / -32° C but still allows feet to breathe; Heat reflecting board provides a thermal underfoot barrier to help lock in warmth TRACTION: KEEN.FREEZE rubber outsole provides high traction grip in cold environments and on icy surfaces; 4mm multi directional lugs; Non marking rubber soles leaves no trace when walking indoors