【FLEXIBLE FOR PERFORMANCE】★ Patent pending shell of 500D rip-stop nylon and strong, flexible plastic with channels to hold small 1/2 pound weights bends to your torso out-performing any weight vest with plates. 6 lb small red plates are small enough to fit any tactical weighted vest and blue 9lb fit compatible tactical vests designed for large strength training plates. Your tactical weight vest for men or women performs better with the weight curving close to your body.