| O'Neill product size | Weight (cm) | Chest (cm) |
| 4 | 45-52 | 77-83 |
| 6 | 50-57 | 80-85 |
| 8 | 54-61 | 83-88 |
| 10 | 59-68 | 86-91 |
| 12 | 64-73 | 90-95 |
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 | Weight (kg) | Chest (cm) |
| XS | 57-64 | 93-95 |
| S | 61-70 | 95-99 |
| M | 70-77 | 99-104 |
| L | 77-86 | 104-110 |
| XL | 86-95 | 110-117 |
| 2XL | 95-104 | 117-123 |
| 3XL | 104-113 | 123-130 |
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 | Height (cm) | Weight (kg) | Chest (cm) | Waist (cm) |
| 6M | 58-68.5 | 5-7.5 | 43 | 42-44.5 |
| 12M | 68.5-73.5 | 7.5-10 | 46 | 44.5-47 |
| 18M | 73.5-79 | 10-12 | 48 | 47-49.5 |
| 1 | 88-98 | 11-13.5 | 48-53 | 45.5-51 |
| 2 | 98-108 | 13.5-16 | 51-56 | 48-53 |
| 3 | 108-118 | 16-18 | 53-58 | 51-56 |
| 4 | 118-126 | 18-25 | 58-64 | 51-56 |
| 6 | 126-133 | 22.5-29.5 | 62-67 | 55-60 |
| 8 | 133-141 | 27-34 | 66-71 | 58-64 |
| 10 | 141-147 | 34-41 | 71-76 | 58-64 |
| 12 | 147-155 | 41-48 | 74-79 | 64-69 |
| 14 | 155-163 | 48-54.5 | 79-84 | 69-74 |
| 16 | 163-170 | 54.5-61 | 84-89 | 71-76 |
Chest:With you arms relaxed by your side, measure around the fullest part of you chest
Waist:Measure around your natural waistline