Timberland Premium Waterproof Winter Explorer Boot - For its warmest women's waterproof boot, Timberland used 57 percent recycled-content Polartecr Thermal Pror fleece to build the insulation liner, which can also be worn separately as a slipper. Built for the coldest climates and most extreme winter weather, the Timberland Premium Waterproof Winter Explorer Boot was inspired by a boot Timberland made for the Iditarod in 1994. The Polartecr Thermal Pror fleece in the liner provides exceptional warmth without weight, high breathability, and quick dry times for comfort. Download