The Booster Strap Expert is a dynamic elastic straps. It's stretch, allow you to cinch them super tight for an increase in performance. Your stock power strap doesn't lock you in like a Booster Strap for an insanely tight closure. They also provides cushioning to keep your shins from bangin' when you're getting ultra-sendy, too.

Booster Strap Features: 

• Instantely improves boots performance and give astonishing ski control.
• Improves comfort and aids in the prevention of shin bangs
• Used by the world's winingest skiers