Optech usa incorporates a patented comfort stretch system into the ideal sling the action sling the 275 by 13 neoprene pad effectively conforms to the contours of your shoulder while evenly distributing weight the internal control stretch system absorbs the shock of your movements normally felt in your shoulder and back the action sling features a non skid surface which effectively grips to your shoulder and also provides extra security when wrapping around the arm for better stability w