To measure your chest size, place the tape measure in your armpits, at the strongest point, and walk around them.

Brand size (US) Chest size (cm)
S 90 - 95
M 95 - 100
L 100 - 105
XL 105 - 110
XXL 110 - 115

To measure your chest size, place the tape measure in your armpits, at the strongest point, and measure all the way round.