The Wear Chemistry Big Logo t-shirt is hand finished & made from 70% Bamboo & 30% organic cotton. It's soft to the touch, feels great against your skin & has moisture wicking properties. Care: 30 degree machine wash, do not use fabric softener, do not use bleach, do not tumble dry, wash with similar colours re-shape while damp, warm iron (do not iron the decoration) Size Guide: Small (92-97cm or 36-38") Medium (97-102cm or 38-40") Large (102-107cm or 40-42")