RPET is the short name for recycled polyethylene tetraphyte (PET). PET is the world’s fourth most common plastic resin, used in everything from food packaging to clothing. When you see the word ‘RPET’ it simply means that the PET in the product you’re looking at, should come from a recycled, pre-existing source.
While the plastic bottle industry uses a huge 30% of all PET created in the world, it is far from the only use case. For instance, many of the clothes in your wardrobe are likely to be made from PET- although it is simply called polyester when discussing clothes. When PET is first created, instead of letting it mold to the shape of a container, the liquid is passed through a spinnerate (almost like a shower head) producing long strands of PET. Tie enough of these together and you have a highly durable, inexpensive, lightweight fabric.