Small - 18.5" PTP
Medium - 19.5" PTP
Large - 20.5" PTP
XL - 21.5" PTP
XXL - 22.5" PTP
These are slim fitting and I would recommend going a size up!
*PTP is the measurement from one arm pit to the other.
If unsure on the fit, compare measurements to another item you have that fits.
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