The North Face Thermoball Lace Up Waterproof Boots. The lightweight, waterproof Women’s ThermoBall™ Lace Up Waterproof are secure-fitting winter boots with durable recycled ripstop uppers and toasty ThermoBall™ Eco insulation. Upper: 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 loops on both sides for easy pull-on. Collar bungee is adjustable to prevent snow from getting in. Synthetic mudguard helps keep the elements out. Oso fleece collar lining for comfort. Comfortable OrthoLite® footbed made with 5% recycled rubber content. Sole Unit Rubber outsole for increased traction. Imported.