F150 F370

Youth:
  YS YM YL YXL
Chest Width 18 1/2 20 21 1/2 23
Sleeve Length 27 1/2 29 1/4 31 32 3/4
Body Length at Back 22 1/2 24 25 1/2 27
Adult:

 Product measurements S M L XL XXL 3XL
Chest width 22 1/4 23 1/4 24 1/2 25 3/4 28 29 1/2
Sleeve length 34 35 1/4 36 1/2 37 3/4 39 40
Body length at back 28 29 30 31 32 33