Disney Juniors Long Sleeve T-shirt Halloween Glow in the Dark Long sleeve tee, 100% cotton, soft and lightweight - layered look, but it is a single layer t-shirt Glow-in-the-dark with Disney print - officially licensed Slim/Juniors sizing - runs small - may want to buy a larger size Armpit to armpit in inches: S=14, M=15, L=16, XL=18, XXL=36 Length in inches from back of neck to bottom: S=25, M=25.5, L=26, XL=26.5, XXL=44