Janna Salak Designs Baby - Im the Big Sister Purple - T-Shirts - Adult Birch-Gray-T-Shirt Medium (ts_13827_19) Adult and youth sizes are a blend of 50% cotton, 50% polyester. Toddler sizes are 100% cotton. Available in white, grey, light blue or pale pink. Custom printed image applied. Washing instructions: Do not use bleach, dry on low heat, turn inside out