Size Charts for O'Neill Life Jackets
Mens Neoprene
| US Size | Chest (in.) |
| X-Small | 33 - 35 |
| Small | 35 - 37 |
| Medium | 37 - 39 |
| Large | 39 - 41 |
| X-Large | 41 - 43 |
| XX-Large | 43 - 45 |
| XXX-Large | 47.5 - 50.5 |
Shop Mens O'Neill Life Jackets
Mens Nylon
| US Size | Chest (in.) |
| X-Small | 29 - 32 |
| Small | 33 - 36 |
| Medium | 37 - 40 |
| Large | 41 - 44 |
| X-Large | 45 - 48 |
| XX-Large | 49 - 52 |
| XXX-Large | 53 - 56 |
Womens Neoprene
| US Size | Chest (in.) |
| Small | 30 - 33 |
| Medium | 34 - 36 |
| Large | 37 - 39 |
| X-Large | 40 - 42 |
| XX-Large | 43 - 45 |
Shop Womens O'Neill Life Jackets
Womens Nylon
| US Size | Chest (in.) |
| 4 | 30 - 32 |
| 6 | 32 - 34 |
| 8 | 34 - 36 |
| 10 | 36 - 38 |
| 12 | 38 - 40 |
Kids
| US Size | Chest (in.) |
| Infant | 00 - 30 |
| Child | 30 - 50 |
| Youth | 50 - 90 |