ABUS CliffHanger MTB helmet - bike helmet for demanding trails - with large ventilation openings & TriVider strap system - for men and women[MULTI SHELL IN MOLD] manufacturing process that creates a durable bond between the shock absorbing EPS inner shell and multiple impact resistant outer shells [FIT] Zoom Ace MTB adjustment system with an adjustment wheel allows the helmet to be precisely adapted to the wearer's individual head circumference the adjustment wheel is even height adjustable [ACTICAGE] "cage" (ActiCage) integrated into the hard foam reinforces the helmet structure the cage