Booster Straps are a bootfitter's go-to solution when skiers come in to the shop complaining about the dreaded (and painful) shin bang. The Booster strap is elastic with anti slip metal cam (that you can really wrench down!), allowing the skier to get an extremely close fit around the top of the boot. The elasticity of the Booster Strap speeds up the boot's response time when turning and leaves less room between your Shin and the boot so they are more "as one" than ever before. The Booster can be used in addition to your stock powerstrap, but to get the most out of it we recommend replacing your powerstrap with the Booster which can usually be done with a screwdriver. There are two levels of Booster: Intermediate which has two elastic bands and the Expert that has 3, offering a bit more resistance for more aggressive skiing.