Castelli Sizing: Many Castelli products are designed with a European race-fit. It is not uncommon to size up one size for a standard, race fit or two sizes for a more relaxed fit.
Measurement Guide:
- Chest: Measure the circumference around the fullest part of chest, under arms
- Waist: Measure circumference around natural waistline keeping the tape a bit loose
| Chest Circumference (in) | Waist Circumference (in) | |
| XS | 34.5" | 30" |
| S | 36" | 31" |
| M | 37.5" | 33" |
| L | 39" | 34.5" |
| XL | 41" | 36.5" |
| 2XL | 43" | 38.5" |
| 3XL | 45" | 40.5" |
Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired. Castelli instructs that for best results measurements be taken over underwear. Castelli recommends sizing up if measurements fall between sizes for a better fit.