ComputerGear Funny Science Physics T Shirt Speed of Light Geek Nerd STEM Tee 100% cotton; Machine wash/dry Small fits chest/bust 34-36 in. chest, Medium fits 38-40, Large fits 42-44, X-Large fits 46-48, plus size 2XL fits 50-52, 3XL fits 54-56, 4XL fits 58-60 Don't stay in the dark with this funny science t-shirt; Makes a fun STEM NASA gift Clever geek tshirt asks "If the Speed of Light is 983,571,008 ft/sec, What is the Speed of Dark?" Witty science physics tee shirts are unisex and fit both men and women Novelty graphic shirts with funny sayings are a ComputerGear&reg copyrighted/trademarked design; DON'T BUY COUNTERFEIT ITEMS FROM OTHER SELLERS