Stay warm, dry, and comfortable on city adventures with the Women’s ThermoBall™ Progressive Zip II Waterproof. These lightweight, waterproof, and low-cut booties feature ThermoBall™ Eco insulation and recycled P.E.T. ripstop uppers. Water-repellent, recycled P.E.T. ripstop upper. Waterproof DryVent™ bootie construction. Non-PFC durable water-repellent (non-PFC DWR) finish to help keep feet dry. Lightweight ThermoBall™ Eco insulation retains warmth even when wet. TNF™-branded webbing pull loop at heel for easy pull-on. Comfortable OrthoLite® footbed made with 5% recycled rubber content.