How to measure:
- Chest: With your arms relaxed by your side, measure around the fullest part of your chest.
- Waist: Measure around your natural waistline.
- Hips: Measure around the fullest part at the top of your hips.
| O'Neill product size | EU size | UK size | Pant size (inches) | Waist (cm) | Hip (cm) |
| XS | 32/34 | 6 | 28-29 | 72-77 | 87-91 |
| S | 34/36 | 8 | 30-31 | 78-82 | 92-96 |
| M | 38 | 10 | 32-33 | 83-87 | 97-101 |
| L | 40/42 | 12 | 34 | 88-93 | 102-106 |
| XL | 42/44 | 14 | 36 | 94-99 | 107-112 |
| XXL | 44/46 | 16 | 38 | 100-105 | 113-118 |