Booster World Cup Power Straps: The strap worn by Bode Miller is now used by a great many skiers of all skill levels … for instant ski response. The Booster Strap guarantees maximum ski boot performance with a quicker start, positive steering and more rebound and therefore extraordinary ski control. The Booster Strap is made of high strength elastomer webbing with an anti-slip micro-adjustable cam buckle. The World Cup uses 3 reinforced elastomer bands which have been engineered to fit the needs of the World Cup skier.