Abus YouDrop Helmet S 48 - 55cm Shiny BlackWhether off road or on the way to school, the YouDrop is a must have for all junior mountain bikers. A helmet with professional features and a casual, lightweight design. In Mould for a permanent bond between the outer shell and the shock absorbing helmet material (EPS) Excellent ventilation with 6 air inlets and 5 air outlets connected by flow channels Zoom Ace MTB: finely adjustable, height adjustable adjustment system for fitting to head size