What size T-shirts does your family need? All shirts are standard, short-sleeve, 100% cotton T-shirts from Gildan. Choose from Toddler sizes (2T, 3T, 4T), Youth sizes (XS, S, M, L, XL), and Adult sizes (XS, S, M, L, XL, XXL, XXXL). Size charts available at Michaels.com if you need help deciding.