Increase any workout’s intensity by adding the 9.07kg (20 lb.) Iron Body Fitness Flex-Fit weighted vest. Push your limits and work your muscles, increase your endurance, and build strength at your own pace, adding and removing the included weight packets to customize the iron sand-filled weights that mold to your body and allow for easy and free movement. | Iron Body Fitness Flex-Fit Weighted Vest - 20 lb