| Spiewak Size | XS | S | M | L | XL | XXL | XXXL |
| Italy | 44 | 46 | 48 | 50 | 52 | 54 | 56 |
| Europe | XS | S | M | L | XL | XXL | XXXL |
| US | XXS | XS | S | M | L | XL | XXL |
| Japan | S | M | L | XL | XXL | XXXL | XXXXL |
| Men's Measurements | XS (cm) | S (cm) | M (cm) | L (cm) | XL (cm) | XXL (cm) | XXXL (cm) |
| Chest Circumference | 87 | 93 | 99 | 104 | 110 | 116 | 122 |
| Waist Circumference | 69 | 75 | 81 | 87 | 93 | 99 | 105 |
| Hips Circumference | 84 | 90 | 96 | 102 | 108 | 114 | 120 |
| Neck Circumference | 38 | 39.5 | 41 | 42.5 | 44 | 45.5 | 47 |