Meteor K20S White Children's Bike Helmet 24838-24839 Technical data: model: white aerodynamic shape outer shell material: PVC absorbent material inside: EPS certificate - product complies with the requirements of Directive 89/686/EEC and the EN 1078 standard helmet dimensions: S circumference 48-52 cm weight 400, M circumference 52-56 weight 420 Properties: AIR FLOW system - the ventilation system guides the air flow through the holes in the helmet shell without negatively affecting its stability QUICK-RELEASE system - quick-release buckles FIT SIZE system - headlock multi-stage ring for smooth circumference adjustment Internal pads ensure comfort while riding and proper fit of the helmet to the shape of the head.