Stone Island Salvia Double Pocket Overshirt

SIZING 

Small - 21" PTP
Medium - 22" PTP
Large -23" PTP
XL - 24" PTP
XXL - 25" PTP
XXXL - 26" PTP

*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.