Pull-on boots from sustainable production. The Cortina Valley Chelsea Boots are made from materials that help protect our planet, including GreenStride™ comfort soles and ReBOTL™ fabric, which is made from at least 50 % recycled plastic.GreenStride™ outsolesThis natural and extra cushioning foam is made from 75 % renewable natural materials: sugar cane and responsibly sourced natural rubber from trees.