These shirts are a polyester cotton blend quality shirt. They wont fade or shrink for a long time. Unlike other promo products we did extensive research to get a quality product that falls right and wont bunch up or ride up on your hips or other parts. Quality screen print ensures that it will not crack or fade for a long time when laundered correctly. Material is sweat wicking and breathable will make a great shirt for wearing in or out of the house or as a base layer for sledding. These shirts fit a bit large so no ne2ed to guess, if you normally wear a xl then a large will fit. The shirts are perfect for tucking in or leaving out for taller riders.