ADJUSTABLE WEIGHT VEST: This one size fits most weighted vest by Zelus comes with adjustable weights, adding plenty of variable low impact resistance to help strengthen your core, grow endurance, and trim fat MAXIMUM COMFORT: Our exercise vest evenly distributes the weight across your torso while its straps with hook and loop fasteners offer a snug fit for both beginners and professional athletes, providing you with a comfortable workout experience DURABLE DESIGN: The reinforced nylon fabric and foam padded shoulder straps give you long lasting comfort combined with wear proof use, able to handle everything from yoga positions to kickboxing, light jogging to intense cycling HI VIS STRIPS: Stay safe and easy to see while out and about in all weather and light conditions thanks to the high-visibility reflective strips on the front, shoulders, and back BUST PLATEAUS: Add this weighted topper to your daily workout routine if you feel like your training progress starts to wane and let it pick up the slack!