RPET stands for recycled polyethylene terephthalate, the type of plastic most reusable bottles are made of. The used PET bottles are cleaned in a special process, heated and granulated into small flakes. These can be further processed into robust fibers. This reduces the already existing mountains of waste instead of producing new plastic waste. The material is accordingly not plastic-free, but upcycled and has a better eco-balance than most synthetic fibers. In addition, it causes significantly less microplastic.