S4 LockDown Bino Harnesses. The right stuff to keep your optics on-hand and "bounce proof". A pliable cover keeps water and dust off the lenses, while the shock-corded bungees keep your binocs from bouncing around. It"s very comfortable, easy to put on, and almost tangle-proof. Available in Small (for roof prism models 4.5"-6") and Large (for roof prism models 6"-7.5"). State Size. Order yours today! S4 LockDown Bino Harness, Black