Size Charts for O'Brien Life Jackets
Shop O'Brien Life Jackets
Adult Neoprene O'Brien Life Jacket Sizing
| US Size | Chest (in.) |
| X-Small | 28 - 32 |
| Small | 32 - 36 |
| Medium | 36 - 40 |
| Large | 40 - 44 |
| X-Large | 44 - 48 |
| 2XL | 48 - 52 |
| 3XL | 52 - 56 |
| 4XL | 56 - 62 |
| 5XL | 62 - 68 |
Adult Nylon O'Brien Life Jacket Sizing
| US Size | Chest (in.) |
| Teen X-Small | 28 - 32 |
| Adult Small | 32 - 36 |
| Adult Medium | 36 - 40 |
| Adult Large | 40 - 44 |
| Adult X-Large | 44 - 48 |
| Adult 2XL | 48 - 52 |
| Adult 3XL | 52 - 56 |
| Adult 4XL | 56 - 62 |
| Adult 5XL | 62 - 68 |
Kids O'Brien Life Jacket Sizing
| US Size | Weight Range |
| Infant | Up to 30 lbs |
| Child | 30 - 50 lbs |
| Youth | 50 - 90 lbs |