ADJUSTABLE WEIGHT VEST: This one-size-fits-most exercise vest by Zelus weighs in at 11 pounds by itself but reaches up to 20 thanks to the included six 1.5 pound iron sand weight bags, allowing variable low impact resistance that strengthens your core and endurance no matter your exercise routine ADJUSTABLE ERGONOMIC DESIGN: Our weighted vest evenly distributes its load even during intense workouts, with its hook-and-loop fasteners offering a snug fit for teens or adults DURABLE & COMFORTABLE: Our soft neoprene material gives you long-lasting comfort combined with long-lasting use, able to handle everything from yoga positions to kickboxing, light jogging to intense cycling HELPFUL & SAFE: Bring along your keys, wallet, or smartphone in the wide pocket so they don't bang against your legs as you exercise; even while out and about, you'll stay safe and easy to see thanks to the high-visibility reflective strips on the front, shoulders, and back Prompt Response: Zelus's adjustable weighted vest comes with our friendly 24/7 customer service; try it at no risk and blow through any plateau with ease