Iris Track Snake is handmade in Portugal and is a practical leather boot with real leather lining. The upper is crafted from embossed leather. All leather is responsibly sourced. The insole is made of a soft PU-foam material, which is both light and shock-absorbing. It is covered with the characteristic WODEN cork to ensure breathability. The outsole is based on our Natural Soft technology. A technology designed to give you the best comfort. The track sole consists of 65% natural rubber, 10% recycled rubber, and 25% conventionally produced rubber.