Inspired by the shoe that started it all in 1973, the Sport Root is an updated version of our negative heel. Now made with a customizable insole system that can be adapted to your preferred heel height, making it a perfect fit for everyone. Durable rubber outsole for better grip and slip resistance on any surface — wet, muddy or dry Ribbed outsole for comfort and grip — a nod to the original outsole from 1973 Shaped to follow the natural foot form for maximum alignment and comfort Strong, durable and waterproof Italian Nappa leather Soft, comfortable and durable leather lining for breathability and moisture absorption Organic cotton laces with a waxed surface to help them stay tied Recycled Cork, EVA and open cell foam molded removeable insoles for a comfortable and secure foot position Padded ankle support keeps foot warm and secure on colder days Negative heel positioning: the heel is positioned slightly below the forefoot, gently stretching the calf muscles and reducing pressure on the foot Made from high-quality leather, our footwear is designed with durability in mind. Full rubber outsoles ensure long-term wear, and leather uppers ensure eventual biodegradability when the footwear is at the end of its life. Made to stand the test of time.