Thanks to the molded air-frame liner the Denison 8 in. offers day-long comfort even when the day goes long. Excess heat is ventilated up and out through innovative molded air channels to prevent sweat. So not only do feet stay cool on hot days, the air circulating combats cold by keeping feet dry and warm. Air Fram Molded Liner Helly Tech Performance Waterproof Membrane HellyGrip Outsole Custom PU Insole Slip Resistant Outsole Meets all SATRA Standards