Older and Wiser, Younger and Cuter Sibling Shirts Set for Sisters and Brothers Amazon size chart is not specific to our brand. Please see Description for dimensions on t-shirts Screen printed design on a Cotton shirt for comfort and softness. Gift Set Includes 1 Youth or 1 Toddler shirt and 1 Bodysuit. Heather Gray shirts are 65/35% cotton-poly blend. The graphic design is a registered copyrighted design. Infringing companies will be prosecuted.