Made from non renewable and non recycled materials??? Not really planet friendly. While concerns have been raised about the durability, I think it fair to point out that PU is a supple, exceptionally tough, hard wearing, UV and chemically material. It will generally outlast PVC by 4-5 fold. Unfortunately it does include PVC as well, which does not bode well for the longevity of those parts. However, if a planet friendly recycled, non animal product is desired, there are alternatives such as recycled bicycle tyre belts. Yes, it's a thing.