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O'Neill follows the sizes XS (XSmall), S (Small), M (Medium), etc.
When the letter S or T is added after the size indication, it is a Short (S) edition or a Tall (T) edition of this size.
So if you pick a wetsuit in Small with the size name ST it is a size Small in a Tall version.
- S = Short
- T = Tall
Size notice:
Feedback from our customers tells, that wetsuits feel small in size. But a tight fit is essential for the suit to work properly. However, beginners sometimes prefer easy usage and larger suits over the recommended tight fit. These customers normally choose one size bigger than the size guide recommends.
O'Neill Men's Wetsuit Size Chart
Imperial
| Size | Height (In) | Weight (Lb) | Chest (In) | Waist (In) |
| XS | 5'7" - 5'9" | 125 - 140 | 36.5" - 37.5" | 28.5" - 29.5" |
| 10T | 5'7" - 5'9" | 135 - 155 | 34" - 36" | 30.5" - 32" |
| S | 5'8" - 5'10" | 135 - 155 | 37.5" - 39" | 29.5" - 31" |
| ST | 6' - 6'2" | 145 - 165 | 37.5" - 39" | 29.5" - 31" |
| MS | 5'6.5" - 5'8.5" | 145 - 165 | 39" - 41" | 31" - 33" |
| M | 5'9" - 5'11" | 155 - 170 | 39" - 41" | 31" - 33" |
| MT | 6'1" - 6'3" | 160 -180 | 39" - 41" | 31" - 33" |
| LS | 5'7.5" - 5'9.5" | 160 -180 | 41" - 43.5" | 33" - 35" |
| L | 5'10" -6' | 170 - 190 | 41" - 43.5" | 33" - 35" |
| LT | 6'2" - 6'4" | 180 - 200 | 41" - 43.5" | 33" - 35" |
| XLS | 5'8.5" - 5'10.5" | 180 - 200 | 43.5" - 46" | 35" - 37" |
| XL | 5'11" - 6'1" | 190 - 210 | 43.5" - 46" | 35" - 37" |
| XLT | 6'3" - 6'5" | 200 - 220 | 43.5" - 46" | 37" - 39" |
| 2XLS | 5'9.5" - 5'11.5" | 200 - 220 | 46" - 48.5" | 37" - 39" |
| 2XL | 6' - 6'2" | 230 - 250 | 46" - 48.5" | 37" - 39" |
| 3XL | 6' - 6'3" | 230 - 250 | 48.5" - 51" | 39" - 44" |
| 4XL | 6'1" - 6'4" | 250 - 270 | 51" - 53.5" | 44" - 48" |
Metric
| Size | Height (cm) | Weight (kg) | Chest (cm) | Waist (cm) |
| XS | 170 - 175 | 57 - 64 | 93 - 95 | 72 - 75 |
| 10T | 170 - 175 | 61 - 70 | 86 - 91 | 78 - 81 |
| S | 173 - 178 | 61 - 70 | 95 - 99 | 75 - 79 |
| ST | 183 - 188 | 66 - 75 | 95 - 99 | 75 - 79 |
| MS | 169 - 174 | 66 -75 | 99 - 104 | 79 - 84 |
| M | 175 - 180 | 70 - 77 | 99 - 104 | 79 - 84 |
| MT | 185 - 190 | 73 - 82 | 99 - 104 | 79 - 84 |
| LS | 171 - 176 | 73 - 82 | 104 - 111 | 84 - 89 |
| L | 178 - 183 | 77 - 86 | 104 - 111 | 84 - 89 |
| LT | 188 - 193 | 82 - 91 | 104 - 111 | 89 - 94 |
| XLS | 174 - 179 | 82 - 91 | 111 - 117 | 89 - 94 |
| XL | 180 - 185 | 86 - 95 | 111 - 117 | 89 - 94 |
| XLT | 190 - 195 | 91 - 100 | 111 - 117 | 94 - 99 |
| 2XLS | 177 - 182 | 91 - 100 | 111 - 117 | 94 - 99 |
| 2XL | 183 - 188 | 104 - 113 | 117 - 123 | 94 - 99 |
| 3XL | 183 - 190 | 104 - 113 | 123 - 130 | 99 - 112 |
| 4XL | 185 - 193 | 113 - 123 | 130 - 136 | 112 - 122 |
How to Measure
Follow the instructions below and compare your measurements with the size chart
Men's Chest Measurement
Measure the circumference of the chest around the widest point.
Men's Waist Circumference
Measure the circumference of the waist around the most narrow point, after you breath out.
Tip! Use a soft measuring tape, to ensure that the product fits properly. Alternatively, use a piece of string and then measure it against a ruler
This size guide only applies to
O'Neill Reactor Shorty 2mm Back Zip Wetsuit
$139.95
O'Neill Reactor 3mm Back Zip Wetsuit
$187.95
O'Neill Epic 5mm Back Zip Wetsuit
$389.95 $299.95
O'Neill Thermo-X Neo Hooded Vest
$101.95
O'Neill Epic 4mm Back Zip Wetsuit
$379.95
O'Neill Hyperfreak 4mm Chest Zip Wetsuit
$579.95 $409.95
O'Neill Hyperfreak 5mm Chest Zip Wetsuit
$599.95 $469.95
O'Neill Blueprint 5mm Chest Zip Wetsuit
$799.95 $529.95
O'Neill Reactor II 1.5mm Short
$90.95
O'Neill Reactor II 2mm Pull Over Vest
$82.95 $37.95
O'Neill Reactor II 1.5mm Long Sleeve Wetsuit Top
$113.95 $102.95
O'Neill Thermo-X Short
$58.95
O'Neill Thermo-X Long Sleeve Youth Wetsuit Top
$66.95
O'Neill Epic 3/2 Back Zip S/S Wetsuit
$339.95
O'Neill Psycho Tech 6mm Chestzip Hooded Wetsuit
$849.95 $599.95
O'Neill Youth Epic 5/4 Back Zip Full Wetsuit
$309.95 $195.95
