Abbi Track Leather is made of leather. All leather is from LWG certified production. The boot has a discreet zipper on the side and is completed with the distinctive track sole. 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 ensure you the best comfort. The track sole consists of 65% natural rubber, 10% recycled rubber, and 25% conventionally produced rubber.