We've reimagined waterproofing with our exclusive TimberDry™ membrane made of 50% recycled plastic. And that's not the only eco-conscious material we used in designing these warm winter boots. This rugged style also features GreenStride™ comfort soles made with renewable bio-based materials.,Shop Timberland.com for Women's Cortina Valley Waterproof Warm-Lined Boots. FREE shipping with membership!