Made for winter hikes, snowshoe adventures, and long, cold days outdoors, the adidas Terrex winter boots are waterproof and fully insulated. COLD.RDY with PrimaLoft® wraps your foot in heat-sealing warmth, while RAIN.RDY seals out slush, snow, and rain to keep feet dry all day long. A BOA® Fit System lets you dial in a precise fit for confident footing. A BOOST midsole cushions and brings energy to every step, on and off the snow and in all temperatures. The Stealth winter grip rubber provides high-friction traction for confident footing on slick, icy ground. - BOA® Fit System for micro-adjustment, effortless on-and-off, and secure, consistent hold