Marker M 4.5 EPS Attiva Ski Bindings (74mm Brakes) ? Youth 2011: Marker builds every junior binding with the same high standards of protection and performance as their adult bindings, adapted to junior proportions and requirements. The Marker M 4.5 EPS ATTIVA has a redesigned heel, reducing the weight of the steel track. Biotech? upward release system, Active AFD, compact step-in heel piece and quick heel systems keep pro skiers in the making safe while offering the same performance and reliability of Markers adult bindings.