17 18 19 20 21 22 22.5 23 24 25 26 27 28 28.5 29 30 31 31.5 32 33 33.5 34 35 35.5 36 36.5 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 44 44.5 45 46 46.5 47.5 48 49 50 51.5 4XS XXXS XXS XS S M L XL XXL XXXL OS Infant