TPR stands for thermoplastic rubber and has properties similar to natural rubber. Soles made of TPR rubber are shock-absorbing, soft, durable, and grip-friendly. The material is not considered environmentally hazardous and is free from prohibited substances. TPR is recyclable, so waste from production and leftover soles are recycled and become new soles. The TPR soles we use have been tested, analyzed, and approved for our EU Ecolabel certified collection.