A tree is planted for every set of flip-flops that is bought. You can recycle their flip-flops and they will give you a 10% low cost voucher When your return your flip flops to get recycled with them. The 2nd team are still synthetics (man made) BUT These are constructed https://rubber-slippers61379.bloggerchest.com/38414621/the-definitive-guide-to-natural-rubber-thongs