CONSCIOUSLY CREATED & MATERIAL: KEEN sources hides from Leather Working Group certified tanneries; Environmentally preferred DWR helps prevent leather from drying out; Premium leather; Warm fleece lining WATERPROOF & STABILITY: KEEN.DRY waterproof breathable membrane keeps feet dry and comfortable all day long by allowing vapor out without letting water in; Stability shank offers lightweight underfoot support for improved mobility on uneven surfaces COMFORT & FIT: Elastic panels for easy on and off; Underfoot cushioning springs back after each step; Removable footbed provides excellent arch support and cradles the foot’s natural contours; KEEN Original Fit gives generous space for toes to spread out 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; Non marking rubber soles leaves no trace when walking indoors; 4mm lugs bite into various terrain