About these items:Dual Storage Pockets: The weighted vest features a front detachable pocket that can be conveniently tied to your arm, and a rear mesh pocket for storing valuables such as phones, keys, and wallets during workouts.Comfortable Material: Made from premium neoprene, this vest is breathable, sweat-proof, and gentle on the skin. The stable, odorless iron pellet filler provides comfortable weight without any unpleasant smell.Reflective Stripes for Safety: Multiple reflective stripes enhance visibility during low-light conditions, reducing the risk of accidents while exercising outdoors, especially in dark or early morning settings.Evenly-Distributed Weights: The weights are evenly distributed throughout the vest for a balanced feel. Padded shoulders relieve stress and provide maximum comfort, ensuring you can focus on your exercise without strain.Personalized Fit: Adjustable double buckles ensure a custom fit for bust sizes ranging from 35" to 45" (89-114 cm), providing support and stability for all body types during various physical activities.Boost Your Workout: Ideal for running, hiking, strength training, or any sport, this vest enhances workouts by adding extra resistance, helping you improve endurance, strength, and overall fitness.Specifications:Item Model Numbers:JS-VEST005-1: 12 lbs / 5.54 kgJS-VEST005-2: 16 lbs / 7.32 kgJS-VEST005-3: 20 lbs / 9.22 kgJS-VEST005-4: 30 lbs / 13.8 kgFixed Weight:JS-VEST005-1: 12 lbs / 5.54 kgJS-VEST005-2: 16 lbs / 7.32 kgJS-VEST005-3: 20 lbs / 9.22 kgJS-VEST005-4: 30 lbs / 13.8 kgColor: BlackMaterial: NeopreneFiller: Iron PelletsBust Size: 35" - 45" / 89-114 cmKey Differences:Weight Options:JS-VEST005-1: 12 lbs / 5.54 kgJS-VEST005-2: 16 lbs / 7.32 kgJS-VEST005-3: 20 lbs / 9.22 kgJS-VEST005-4: 30 lbs / 13.8 kgWeight Distribution: All models feature evenly distributed weights and padded shoulders for comfort, with variations in total weight for tailored intensity during workouts.Size Range: All models support bust sizes between 35" to 45" (89-114 cm), ensuring a personalized fit for users of different body types.Package Contents:All Models (JS-VEST005-1, JS-VEST005-2, JS-VEST005-3, JS-VEST005-4):1 x Weighted Vest1 x Detachable Pocket1 x Manual