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Modern versions of the classic 3/4 helmet may look similar to the "crash helmets" of yesteryear but don't let those looks rub you the wrong way, especially when you're peeping at the Shoei J-O Helmet. The JO Helmet is constructed from Shoei's AIM (Advanced Integrated Matrix) shell for an ultra-lightweight, rigid and resilient shell structure. The helmet features a goggle-inspired, three position drop-down visor available in multiple tints (sold separately). The Nubuck leather trim, glasses compatible cheek pads and a dual layer EPS liner designed for improved ventilation provide a comfortable experience start to finish.
| Helmet Size | Centimeter | Hat Size | Inches |
| XXS | 51-52 | 6 3/8 - 6 1/2 | 20 1/8 - 20 1/2 |
| XS | 53-54 | 6 5/8 - 6 3/4 | 20 7/8 - 21 1/4 |
| Small | 55-56 | 6 7/8 - 7 | 21 5/8 - 22 |
| Medium | 57-58 | 7 1/8 - 7 1/4 | 22 1/2 - 22 7/8 |
| Large | 59-60 | 7 3/8 - 7 1/2 | 23 1/4 - 23 5/8 |
| Extra Large | 61-62 | 7 5/8 - 7 3/4 | 24 - 24 3/8 |
| XX-Large | 63-64 | 7 7/8 - 8 | 24 3/4 - 25 1/4 |
| XXX-Large | 65-66 | 8 1/8 - 8 1/4 | 25 5/8 - 26 |
