Size Chest Length Sleeve
S 18.9" / 48 cm 26.0" / 66 cm 7.1" / 18 cm
M 19.7" / 50 cm 26.8" / 68 cm 7.5" / 19 cm
L 20.5" / 52 cm 27.6" / 70 cm 7.9" / 20 cm
XL 21.3" / 54 cm 28.3" / 72 cm 8.3" / 21 cm
2XL 22.0" / 56 cm 29.1" / 74 cm 8.7" / 22 cm

Most customers prefer to size up.