Size Length Sleeve Chest Shoulders (1/2)
S 27.6" / 70 cm 8.3" / 21 cm 40.2" / 102 cm 17.5" / 44 cm
M 28.0" / 71 cm 8.5" / 22 cm 42.1" / 107 cm 18.1" / 46 cm
L 28.3" / 72 cm 8.7" / 22 cm 44.1" / 112 cm 18.7" / 47 cm
XL 28.7" / 73 cm 8.9" / 23 cm 46.1" / 117 cm 19.3" / 49 cm
2XL 29.1" / 74 cm 9.1" / 23 cm 48.0" / 122 cm 19.9" / 51 cm

Most customers prefer to size up.