Recycled polyester is a sustainable yarn. It offsets use of crude oil, conserving precious natural resources & energy. The difference between virgin polyester and recycled polyester is that the former is created from scratch using fossil fuels, whereas the latter relies on post-consumer plastic. Wasted polyester is toxic to the earth. Among the trend is recycled plastic bottles being turned into fabrics which are considered sustainable to keep from them piling in the landfills. From a strictly environmental point of view, recycled polyester is more sustainable than virgin polyester.