Size Chart (Apparel) - Giant Helmet
Giant Helmet - Adult
| Fit | S | M | L |
| Western | 51 ~ 55 | 55 ~ 59 | 59 ~ 63 |
| Asian | 51 ~ 57 | 55 ~ 61 | 59 ~ 65 |
Giant Helmet - Adult
| Fit | S | M | L |
| Western | 51 ~ 55 | 55 ~ 59 | 59 ~ 63 |
| Asian | 51 ~ 57 | 55 ~ 61 | 59 ~ 65 |
Giant Helmet - Youth
| FIT | OSFM |
| WESTERN | 49 ~ 57 |
| ASIAN | 51 ~ 59 |
Giant Helmet - Kid
| Age | 4~10 years old |
| UNIVERSAL | 50 ~ 55 |