All sizes are approximate:
S – size 36 – 38 – 18″/47cm diameter across chest | 26″/68cm length
M – size 40/ 42 – 21″/53cm width across chest | 28″/70cm length
L – size 42/44 – 22″/56cm width across chest | 29″/73cm length
XL – size 46/48 – 24″/61cm width across chest | 30″/76cm length
XXL- size 49/52 – 26″/67cm width across chest | 30″/76cm length
XXXL-size 54/56 – 27″/68cm width across chest | 31″/78cm length