The Anon Merak Wave Cel helmet is loaded with top-end features & 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 ABS hard shell which is tough & durable; the bottom section uses in-mould to keep the weight to a minimum. The impact-absorbing EPS foam inner has an integrated Wave Cel layer, a collapsible cellular structure of interconnected shock absorbers that can flex, crumple & glide in the event of an accident; this process allows it to absorb energy & divert rotational forces away from the head. A powerful active venting system allows airflow & 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 & ear pads are moisture-wicking, ultra quick-drying & provide all-day warmth & comfort. A dial on the rear 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 h&, even with gloves on, & the ear pads are audio compatible. Size Guide Medium Large 56-59cm 60-62cm Click here for more information on our Size & Fit Guide Venting: Active Sizing System: Adjustable Weight: 480g Construction: Hybrid Safety standard: EN 1077 Class B, ASTM F 2040