Women’s ThermoBall™ Progressive Zip II Waterproof Boots 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. Upper| Water-repellent, recycled P.E.T. ripstop upper. Lightweight ThermoBall™ Eco insulation retains warmth even when wet. Overall, in good lightly worn pre owned condition. The tread is still in excellent condition as well.