Head Supershape Ti Pro System Ski - Men's: Shocking the competition into submission. HEAD”S KERS provides a distinctly unfair advantage in this race bred all mountain ski. Whether for one of our World Cup Rebels or for the all mountain skier, KERS helps bring home the feeling of perfect control and stability. Europe’s best selling collection just got a USA update with KERS, 78mm waist, all wrapped into a 13.5 meter turn radius. Awesome for when you never know what the conditions will be.