Seeland Men's Jackets & Shirts Size Guide
| Size | EU Size | Chest (Approx) |
| XS | 44 | 34" |
| Small | 46 | 36" |
| Small/Medium | 48 | 38" |
| Medium | 50 | 40" |
| Large | 52 | 42" |
| XL | 54 | 44" |
| XL/XXL | 56 | 46" |
| XXL | 58 | 48" |
| 3XL | 60 | 50" |
| 3XL/4XL | 62 | 52" |
| 4XL | 64 | 54" |
| 5XL | 66/68 | 56"/58" |
| Size | EU Size | Chest (Approx) |
| XS | 44 | 34" |
| Small | 46 | 36" |
| Small/Medium | 48 | 38" |
| Medium | 50 | 40" |
| Large | 52 | 42" |
| XL | 54 | 44" |
| XL/XXL | 56 | 46" |
| XXL | 58 | 48" |
| 3XL | 60 | 50" |
| 3XL/4XL | 62 | 52" |
| 4XL | 64 | 54" |
| 5XL | 66/68 | 56"/58" |