Put the butt of the spear in the shoe, clip the strap round the haft and you can sling your spear over your shoulder and have both hands free. When you're not using it there's another popper by the shoe so you can clip it to itself. Fits a spear of approx. 175mm (7inch) circumference - if your spear shod is too large or small get in touch and we can sort a custom one for you.