The leather straps by DETOMASO are made of 100% vegetable-tanned cowhide leather. They are handcrafted in a small workshop in Italy. Our mesh and steel straps are made of hypoallergenic 316L surgical steel. Additionally, we offer straps made from #tide ocean material®, which is recycled plastic collected from coastal areas before it can reach the sea. For our reTPU strap, we also use upcycled material: Depending on the color, the straps are made of 70 to 100% recycled plastic.