The Keen Greta Tall Waterproof Boot is winter-ready with cold-weather traction, 200g of insulation, and a tall quilted collar. It features KEEN.WARM insulation and a Thermal Heat Shield insole combine to give this boot a comfort rating of -25 degrees. The KEEN.DRY membrane helps to keep water out. This winter boot features the original Keen fit, with generous space across the forefoot for toes to spread out.