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ATAK Brand Size Guides
| Unisex Size | Mens Chest | Womens | Kids | |
| CM | INCH | |||
| YS | 30 | 76.2 | 4 | S |
| YM | 32 | 81.3 | 6 | M |
| YL | 34 | 86.4 | 8 | L |
| S | 38 | 96.5 | 10 | - |
| M | 40 | 101.6 | 12 | - |
| L | 42 | 106.7 | 14 | - |
| XL | 44 | 111.8 | 16 | - |
| 2XL | 46 | 116.8 | 18 | - |
| Unisex Size | Mens Waist | Womens | Kids | |
| CM | INCH | |||
| YS | 24 | 61 | 4 | S |
| YM | 26 | 66 | 6 | M |
| YL | 28 | 71.1 | 8 | L |
| S | 30 | 76.2 | 10 | - |
| M | 32 | 81.3 | 12 | - |
| L | 34 | 86.4 | 14 | - |
| XL | 36 | 91.4 | 16 | - |
| 2XL | 38 | 96.5 | 18 | - |
| UK | EU |
| 3-5 | 35-38 |
| 6-8 | 39-42 |
| 9-12 | 43-47 |