Ultimate Direction Men's Running Hydration Vest's

Size	Ribs (in)	Ribs (cm)
SM	23 - 32	58.4 - 81.3
MD	30 - 39	76.2 - 99.0
LG	37 - 46	93.0 - 116.8
XL	44 - 52	111.8 - 132.1

 

How to Measure: 

RIBS: Measure around the bottom of your ribs.