Unsure of your size? Take one of your own (non-stretch) shirts that fits well; measure it from the bottom of one armpit across to the other armpit and double the result. Compare the measurement with the "Actual armpit seam to armpit seam (inch/cm)" box displayed below. If it falls between two sizes, we suggest you order the larger size.
For example, measurement = 24 inches; X 2 = 48 inches; the right size is M.
| Sizes | Actual armpit seam to armpit seam (inch/cm) | Fits chest (inch/cm) |
| S | 46" (117 cm) | 36 - 40" (92 - 102 cm) |
| M | 48" (122 cm) | 38 - 42" (97 - 107 cm) |
| L | 50" (127) | 40 - 44" (102 - 112 cm) |
| XL | 52" (132 cm) | 42 - 46" (107 - 117 cm) |
| XXL | 54" (137 cm) | 44 - 48" (112 - 122 cm) |