Meant to fit small. order two sizes up from regular size if you are an adult (recommended) I RECOMMEND GOING UP A SIZE OR TWO. I typically wear xs (adult) and the medium was nice and still loose. For a tighter fit simply go up ONE size. Created to fit in any kid's active schedule, these kid's tee shirts pack both comfort and agility. Made 100% with combed ring-spun cotton for total comfort whether it's studying or playing time. The fabric is soft-washed and garment-dyed. Meanwhile, the classic fit makes it the perfect choice for day-long wear. .: 100% combed ringspun cotton .: Light fabric (5.4 oz/yd² (183 g/m²)) .: Classic Fit .: Sew-in twill label