Danita Delimont - Wildlife - Yellow-bellied Marmot wildlife, Rocky Mountain NP - NA02 RNU0850 - Rolf Nussbaumer - T-Shirts 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