The Intermediate Booster Strap is the ultimate accessory to improve the performance of your ski boots. This strap will keep the liner/tongue firmly against your shin, allowing the outer shell to move freely and function properly. The double elastic strap is the key and will improve your skiing technique as you now can transfer energy directly to your ski with no gap between your shin and liner. This is the best set of Booster straps you can buy! If you are an Intermediate Skier you need to get yourself a set of these! The Booster Strap allows for maximum boot performance and astonishing ski control! Two straps included, one for the right boot and one for the left boot.