*Uni-sex one size fits all, some boxes are marked as S/M  or L/G  but all are the same size* What You Need To Know About the WODmaster Weight Vest Grab the only weight vest specifically designed for WODs like Murph and Clovis with the Adjustable WODmaster Weight Vest. The weight is fixed at 20lbs - exactly the right weight for most Hero WODs! Has reflective stripes on front and back for night workouts. Unlike most vests on the market, the WODmaster weight vest is designed to hug the body and has 6 points of adjustment to snug the vest tight against your body. The WODmaster weight vest was designed and tested with running, pushups, kipping pullups, normal pullups, squats, burpees, thrusters, and more. It safely and comfortably hugs your body through all these movements! We have provided a chart below to help you determine which vest will work best for you. Some info on measurements that might help.¬¨‚Ć The High Point Shoulder (HPS) is measured from the highest point of the shoulder to the bottom hem of the shirt. For the bust/width measurement, you should measure across the bust below the armhole, seam to seam.  Those 2 measurements should help you determine the right vest for you. Package Contents and Specifications Quantity: 1 - WODmaster Adjustable Weight Vest (or Quantity 3 if 3-Pack is selected) Weight: 20 pounds each. Material: Neoprene, Nylon Straps, and Velcro. Size: Small / Medium or Large/X-Large Warranty: 1 Year New Column New Column New Column Size HPS Bust Small / Medium 28.5" - 29.5" 19.75" - 21.25" Large / X-Large 29.5" - 30.5" 21.25" - 22.75" Frequently Asked Questions: Q: What is the vest filled with for the weight?  A: The WOD Master Weight Vest is filled with sand. Yes, Sand! Quantity: 1 - WODmaster Adjustable Weight Vest (or Quantity 3 if 3-Pack is selected) PLUS - THIS VEST WAS VOTED "BEST WEIGHT VEST FOR WALKING" BY COOP AND GARAGE GYM REVIEWS!!