Seal Flex Mens Trousers & Overtrousers Size Guide
| Size | Chest (Cm) | Chest (Inches) |
| Small | 71-78 | 28-30.5 |
| Medium | 79-86 | 30.5-34 |
| Large | 87-94 | 34-37 |
| XL | 95-102 | 37-40 |
| XXL | 103-110 | 40-43 |
| 3XL | 111-118 | 43-46.5 |
| 4XL | 119-126 | 46.5-49.5 |
| 5XL | 127-135 | 49.5-53 |
| Size | Chest (Cm) | Chest (Inches) |
| Small | 71-78 | 28-30.5 |
| Medium | 79-86 | 30.5-34 |
| Large | 87-94 | 34-37 |
| XL | 95-102 | 37-40 |
| XXL | 103-110 | 40-43 |
| 3XL | 111-118 | 43-46.5 |
| 4XL | 119-126 | 46.5-49.5 |
| 5XL | 127-135 | 49.5-53 |