Stay warm, dry and comfortable on city adventures with the Women’s ThermoBall™ Progressive Zip II Waterproof Boots. These lightweight, waterproof and low-cut boots features ThermoBall™ Eco insulation and recycled P.E.T. ripstop uppers. Our waterproof footwear incorporates a variety of advanced waterproofing materials, treatments, and processes. To help keep feet dry, we use internal waterproof membranes and/or adhesive and seam-seal constructions.