John Mayer Pop Rock Music Tee T-Shirt S : Width = 18.5", Length = 27.0 ", M : Width = 19.5", Length = 28.0 " L : Width = 21.0", Length = 29.0 ", XL : Width = 22.0", Length = 30.0 " Cotton Fabric, Light, Thin, Unisex but it runs smaller than US Size.The chest size is measured from armpit to armpit. Handmade item by screen print, Machine wash cool & inside out