The strap slips around your neck, allowing you to lock your arms into the grooved sections padded at each side of the metal pistol arm, it's a great and essential piece in your arsenal. A product that provides more isolation, which means more tension and pressure on the biceps and triceps muscles. More muscle stress equals more growth potential Features a contoured panel that isolates arms and shoulders while keeping the back and elbows in a proper position for curling exercises Thicker, padded elbow pads for safety and comfort Fully adjustable strap Superior foam neck liner One size fits Everyone, it fits your body shape