Ai Riders - Size Guide - Boys
| AGE | HEIGHT (CM) | CHEST (CM) | WAIST (CM) |
| 3-4 Y | 104 | 56 | 54 |
| 4-5 Y | 110 | 58 | 55 |
| 5-6 Y | 116 | 60 | 56 |
| 6-7 Y | 122 | 63 | 58 |
| 7-8 Y | 128 | 66 | 60 |
| 9-10 Y | 140 | 71 | 63 |
| 11-12 Y | 152 | 76 | 66 |
| 13-14 Y | 158 | 82 | 69 |
| 14-15 Y | 164 | 86 | 73 |
| 15-16 Y | 170 | 90 | 76 |
| 16-17 Y | 176 | 94 | 80 |