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Youth:

 Product measurements Youth S Youth M Youth L Youth XL
Chest 26-28 28-30 30-32 32-34
Body length at back 23 25 26 28

 

Adult:

 Product measurements S M L XL XXL 3XL 4XL
Chest 34-36 38-40 42-44 46-48 50-52 54-56 58-60
Body length at back 29 30 31 32 33 34 34