NWT - never worn. Ordered two sizes and kept the other for myself. OUTER SHELL 99% cotton 1% elastane Which has at least: OUTER SHELL 15% RCS-certified recycled cotton CERTIFIED MATERIALS RCS CERTIFIED RECYCLED COTTON This fiber is made from recycled cotton textile waste. Using recycled materials helps limit the consumption of raw materials. It is certified to the Recycled Claim Standard (RCS), which verifies the recycled content and tracks it from source to final product.