The BOOSTER wraps like a big rubber band around the boot top and your lower leg. It removes all that extra space without having to over tighten the buckles. You'll get a quicker start to your turn and more rebound from The BOOSTER Strap. By using specially woven elastic webbing the BOOSTER creates an elastic bond between your leg and your boot. Preloading the BOOSTER allows you to control the response of your skis. Features: -Revitalizes boots that have become sloppy with age -Bonds boot to leg elastically -Better response without tightening buckles -Remedy for looseness at the upper cuff -Stops shin bang -Several models available for the exact skier match -Fits all ski boots, adjustable to every skier