The Merak is loaded with top-end features and the latest safety technologies, perfect for those wanting the very best. Using a 50/50 hybrid construction, the top section is made from an Endura hard shell which is tough and durable; the bottom section uses in-mould to keep the weight to a minimum. The impact-absorbing EPS foam inner has an integrated Wavecel layer, a collapsible cellular structure of interconnected shock absorbers that can flex, crumple and glide in the event of an accident; this process allows it to absorb energy and divert rotational forces away from the head. A powerful active venting system allows airflow and temperature to be controlled by sliding a button; it has 19 vents in total, 8 of which are fully adjustable. The Polartec Power Grid fleece lining and ear pads are moisture-wicking, quick-drying and provide all-day warmth and comfort. A dial on the rear of the helmet controls the 360° BOA fit system which wraps around the head, simply twist for micro-adjustment. The magnetic Fidlock chin buckle can be opened/closed using one hand, even with gloves on, and the helmet is compatible with Outdoor Tech aftermarket headphones. Size GuideSmallMediumLarge52-55cm56-59cm60-62cmClick here for more information on our Size & Fit GuideVenting: Active Sizing System: AdjustableWeight: 480gConstruction: HybridSafety standard: EN 1077 Class B, ASTM F 2040Additional SafetyWaveCel technology behaves like a network of hundreds of interconnected shock absorbers that sit between your head and the outer shell of the helmet. It helps distribute the energy from an impact, reducing forces like a crumple zone of a car and then helping to divert rotational forces by flexing and gliding. VentingActive ventilation enables the wearer to fine-tune airflow through the helmet by sliding the vent control button. The helmet has 19 vents in total, 8 of which are fully adjustable, so you are set whatever the weather conditions. Sizing SystemThe fully integrated 360° BOA Fit System wraps completely around the wearers head allowing for micro-adjustment by simply twisting the dial at the rear. ConstructionThe 50/50 hybrid construction uses a tough and durable Endura hard shell on the top half and featherweight in-mould construction on the bottom, combining the best of both.