Meteor KS07 24890-24891 Bicycle Helmet The lightest of our children's and youth helmets. Its minimal weight doesn't burden the head or neck. It features technology that makes the shell stiffer, more impact-resistant, and lighter. Eleven vents in the AIR FLOW system efficiently ventilate the interior of the helmet. The helmet boasts enhanced aerodynamics. Technical data: outer shell material - PVC EPS absorbent material inside certificate - product complies with the requirements of Directive 89/686/EEC and the EN 1078 standard helmet dimensions: S circumference 48-52 cm, M circumference 52-56 cm 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 Removable lining elements - it's easier to keep sweat-absorbing elements clean when they can be washed and dried efficiently Foam lining isolates the head from the shell, ensuring comfort. It also provides excellent grip. plus SKATE - a helmet model designed for cycling, inline skating, roller skating and skateboarding.