Twin Boys Matching Shirts, Tshirts for Twins, He Did it Shirt, Includes 2 Shirts Amazon size chart is not specific to our brand. Please see Description for dimensions on t-shirts Screen printed design on Cotton tshirts for comfort and softness. Gift Set Includes 2 t-shirts Heather Gray shirts are 65/35% cotton-poly blend. The graphic design is a registered copyrighted design. Infringing companies will be prosecuted.