Men's Running Vest
| Size | CM | IN |
| SM | 58 - 81 | 23 - 32 |
| MD | 76 - 99 | 30 - 39 |
| LG | 94 - 117 | 37 - 46 |
| XL | 112 - 132 | 44 - 52 |
Women's Running Vesta
| Size | CM | IN |
| XS/S I SM | 53 - 92 | 21 - 36 |
| S/M I MD | 62 - 102 | 24 - 40 |
| M/L I LG | 71 - 108 | 28 - 42 |
| L/XL I XL | 96 - 116 | 38 - 46 |
Size Guide
- Ultimate Direction hydration packs clearly distinguish between men's and women's models. Men's models end with the word Vest, while women's models end with Vesta.
- To measure your size for Ultimate Direction, wear the shirt you plan to run in while measuring. For both men and women, measure the width across the lower ribcage and compare it to the size chart.