warm on your urban adventures this winter with these lightweight, water-resistant, low-cut booties that feature ThermoBall Eco insulation. . TNF Lightweight ThermoBall insulation helps keep feet warm in cold conditions. WATER RESISTANT. This boot is made with waterproof, 100% recycled PET ripstop material with durable water-repellent finish to keep feet dry in wet conditions. ORTHOLITE CUSHIONING. OrthoLite Eco LT footbed made with 5% recycled rubber content provides comfort from the inside out so you can stay on your feet. An oso fleece collar lining