Size Charts for O'Neill Rash Guards
Mens
| US Size | Weight (lbs.) | Height | Waist (in.) |
| Small | 135 - 155 | 5'8" - 5'10" | 29 - 31 |
| Medium | 155 - 190 | 5'10" - 6' | 32 - 34 |
| Large | 190 - 210 | 5'11" - 6'1" | 35 - 37 |
| X-Large | 210 - 230 | 6' - 6'2" | 38 - 40 |
| XX-Large | 230 - 250 | 6' - 6'3" | 41 - 43 |
Shop Womens O'Neill Rash Guards
Womens
| US Size | Height | Weight (lbs.) | Bust | Waist (in.) |
| XX-Small | 5'1" - 5'5" | 90 - 115 | 29.5 - 32.5 | 23 - 26 |
| X-Small | 5'3" - 5'6" | 100 - 125 | 30.5 - 33.5 | 24 - 27 |
| Small | 5'4" - 5'7" | 110 - 135 | 31.5 - 34.5 | 25 - 28 |
| Medium | 5'5" - 5'8" | 120 - 150 | 32.5 - 36 | 26 - 29 |
| Large | 5'7" - 5'11" | 140 - 170 | 35.5 - 39.5 | 29 - 32 |
| X-Large | 5'9" - 6' | 150 - 185 | 37 - 40.5 | 30 - 34 |