100% Cotton Ateesdas is the only authorized seller. Please don’t buy our products from other fake sellers. Sizing to YXL !!! Half chest width (inches): YXS=16; YS=17; YM=18; YL=19; YXL=20. Kid youth ultra cotton short sleeve tee T-shirt soft and comfortable. 100% cotton. Wash with cold water, inside out. Ateesdas is an Amazon Registered Brand. Our T-shirts are custom printed with love in USA.