T Shirt, white graphics on red base shirt, Keep Calm and Put Your Lab Coat On (front), Science Saves Lives (back). Gildan Ultra Cotton t-shirt, 100% cotton, made in El Salvador. Tagged as a Size M, Medium. Sizes vary between brands - please note actual measurements. Measuring laying flat. Armpit to armpit = 19.5 inches. Back, down center, not counting collar band = 26 inches. Pre-owned item in good condition, good decoration, light wear/use, no holes, no tears, no stains.