IMPORTANT. The sizing of Iron Heart tops (as with most Japanese brands) runs smaller than their Western equivalents (of S, M, L etc). Please do not assume that because you are normally an L, that you will be an L in these, you really should check the measurements below.

| Centimetres | S | M | L | XL | XXL | XXXL | | Length | 58 | 60 | 62 | 64 | 66 | 68 | | Shoulders | 43.5 | 45.5 | 47.5 | 49.5 | 51.5 | 53.5 | | Chest | 105 | 109 | 113 | 117 | 121 | 125 | | Bottom | 94 | 98 | 102 | 106 | 110 | 114 | | Arm | 62 | 63.5 | 65 | 66.5 | 68 | 69.5 | | Cuff | 10.5 | 11 | 11.5 | 12 | 12.5 | 12.5 |
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| Inches | S | M | L | XL | XXL | XXXL | | Length | 22.6 | 23.4 | 24.2 | 25.0 | 25.7 | 26.5 | | Shoulders | 17.0 | 17.7 | 18.5 | 19.3 | 20.1 | 20.9 | | Chest | 41.0 | 42.5 | 44.1 | 45.6 | 47.2 | 48.8 | | Bottom | 36.7 | 38.2 | 39.8 | 41.3 | 42.9 | 44.5 | | Arm | 24.2 | 24.8 | 25.4 | 25.9 | 26.5 | 27.1 | | Cuff | 4.1 | 4.3 | 4.5 | 4.7 | 4.9 | 4.9 |
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