GEEK TEEZ 2015 Hill Valley Hoverboard Champ Men's T-Shirt Printed in the USA exclusively by GEEK TEEZ. High quality, super-soft cotton screenprinted in-house using water-based, environmentally friendly inks. GEEK TEEZ is the only authorized seller of this product. We cannot guarantee garment sizing, material, print quality, or timely shipping if purchased through another seller. Most colors are 100% cotton; Heather Grey is 90% cotton/10% polyester.