Combining city style with mountain-ready tech, the ThermoBall™ Progressive II Waterproof Zip-Up Winter Boots don’t look like insulated boots, but that’s exactly what they are. They're engineered with DryVent™ technology that's not only waterproof, but breathable for all-day comfort whether you're spending the day indoors or out. Thermoball™ Eco insulation will keep your feet toasty even when it’s damp. And the grippy rubber soles and supportive OrthoLite® footbeds mean you can pound wintery pavements with confidence and in comfort.