Positioned properly on your ski boot, the Booster strap provides instant ski response at the start of the turn & greater rebound out of it. It links your leg to the ski boot liner more effectively & is excellent for individuals with low volume lowerlegs who want to maximise lower leg envelopment & all-round response. This advanced version is more forgiving than its expert counterpart, with 2 layers of elastic compared to 3 giving a more comfortable boost in performance.