O'Neill Wetsuit Hood Size Chart
| XXS | 13.5"-14.5" | 18"-20" |
| XS | 14"-15" | 19"-21" |
| SM | 14.5"-15.5" | 20"-22" |
| MD | 15"-16" | 21"-23" |
| LG | 15.5"-16.5" | 22"-24" |
| XL | 16"-17" | 23"-25" |
| XXL | 16.5"-17.5" | 24"-26" |
| XXS | 13.5"-14.5" | 18"-20" |
| XS | 14"-15" | 19"-21" |
| SM | 14.5"-15.5" | 20"-22" |
| MD | 15"-16" | 21"-23" |
| LG | 15.5"-16.5" | 22"-24" |
| XL | 16"-17" | 23"-25" |
| XXL | 16.5"-17.5" | 24"-26" |