This RN 365 black t-shirt is crafted out of 100% cotton. This t-shirt is made with organic cotton, which, by BOSS standards, means no synthetic fertilizer, pesticides, or genetically modified seeds are used. The BOSS three stripes are seen on a small tag sewn at the hem of the t-shirt. This BOSS t-shirt is perfect for wearing on its own or underneath a shirt, and is soft and comfortable, making it perfect for everyday use.