Waterproof, insulated boots. Mt. Hayes conquer the outdoors with a warm, full lining and 200 grams of PrimaLoft® insulation. Exclusive TimberDry™ technology reimagines waterproofing with a membrane made of 50% recycled plastic, while a rubber lug outsole helps you stay on your feet in slippery conditions. Inside, enjoy the comfort of a lightweight OrthoLite® footbed and foam cushioning.