Ultimate Direction Women's Running Vests Size Guide
| Size | Ribs (Inches) | Ribs (Centimeters) |
| XS/SM | 21-36 | 53.34-91.44 |
| SM/MD | 24-40 | 60.96-101.60 |
| MD/LG | 28-42 | 71.12-106.68 |
| LG/XL | 38-46 | 95.52-116.84 |
How to Measure:
RIBS: Measure around the bottom of your ribs.