| O'Neill product size | EU size | UK size | Chest (cm) | Waist (cm) |
| XS | 32/34 | 6 | 80-84 | 60-64 |
| S | 34/36 | 8 | 85-89 | 65-69 |
| M | 38 | 10 | 90-94 | 70-74 |
| L | 40/42 | 12 | 95-99 | 75-79 |
| XL | 42/44 | 14 | 100-104 | 80-84 |
Chest:With you arms relaxed by your side, measure around the fullest part of you chest
Waist:Measure around your natural waistline.
| O'Neill product size (EU/UK) | Chest (cm) | Waist (cm) |
| XS | 87-92 | 72-77 |
| S | 93-97 | 78-82 |
| M | 98-102 | 83-87 |
| L | 103-107 | 88-93 |
| XL | 108-114 | 94-99 |
| XXL | 115-122 | 100-107 |
Chest:With you arms relaxed by your side, measure around the fullest part of you chest
Waist:Measure around your natural waistline.
| Age | Product size (EU) | Chest size (cm) | Waist size (cm) | Hip size (cm) |
| 1.5-2 | 92 | 54 | 49 | 54 |
| 2-3 | 98 | 55 | 50 | 56 |
| 3-4 | 104 | 56 | 51 | 58 |
| 5-6 | 116 | 58 | 53 | 62 |
| 7-8 | 128 | 62 | 56 | 66 |
| 9-10 | 140 | 66 | 59 | 70 |
| 11-12 | 152 | 72 | 64 | 76 |
| 13-14 | 164 | 78 | 69 | 82 |
| 14-15 | 176 | 84 | 74 | 88 |
Chest:With you arms relaxed by your side, measure around the fullest part of you chest
Waist:Measure around your natural waistline.