Helmet with WaveCel® Technology WaveCell® helmets are designed to fit closer to the head, providing a snug, comfortable fit Please refer to the sizing chart for accurate measurements If you are in-between sizes, you may want to size up Passive ventilation channels 360° BOA® Fit System Fidlock® snap helmet buckle Goggle clip is removable without tools The Adult Windham WaveCel® Helmet from Anon pairs everyday hardshell durability with the advanced impact protection of WaveCel® technology.  WaveCel® behaves like a network of hundreds of interconnected shock absorbers connecting your head and the outer shell of the helmet.  WaveCel® helps distribute the impact energy through its network of cells, reduces impact forces like the crumple zone of a car, and then helps divert rotational forces by flexing and gliding.  A 360° BOA® Fit System offers a quick, micro-adjustable fit with the turn of a dial.  The Fidlock® magnetic helmet strap buckle allows for easy one-hand operation, even with your gloves are on.  Polartec® Power Grid® fleece liner and ear pads maintain quick-drying warmth for all-day comfort.  The sleek fixed vents keep the air flowing for fog-free goggles. Anon Windham WaveCel Helmet