Holo Core: This unique construction resembles an egg carton and provides an extended crumple zone for even better cushioning. Fidlock buckle: Keeps the helmet securely in place on the head. Active Aircon Venting: An innovative ventilation system that actively directs warm air away from the head through the Holo Core. Merino 3M X-Static inner lining: Keeps the head cool on warm spring days and warm on cold winter days. 360° Fit System: With the progressive 360° Fit System, the helmet can be individually fine-tuned not only to head size but also to head shape. ABS Hard Shell: ABS full-shell helmets protect the head from the sides, top, back, and even over the ears.