ZARA KNIT V-NECK TOP & KNIT SHORTS Size Small COLOR: Black & White stripes OUTER SHELL 58% viscose 42% polyester Which has at least: OUTER SHELL 42% RCS-certified recycled polyester CERTIFIED MATERIALS ROS CERTIFIED RECYCLED POLYESTER Nowadays, recycled polyester is mainly made from PET plastic waste. This is a type of plastic that is widely used in a variety of items, such as plastic bottles. Using recycled materials helps limit the production of virgin polyester fiber. It is certified to the Recycled Claim Standard (RCS), which verifies the recycled content and tracks it from source to final product.