Features of the Anon Merak WaveCel Helmet Weight: 480g WaveCel helmets Are designed to Fit closer to the head, providing a snug, comfortable Fit. Please refer to our sizing chart for accurate measurements. If you Are in-between sizes, you may want to size up. In-shell 360? BOA Fit System Features a Fit dial just below the helmet shell that provides micro adjustments in a complete halo around the weArer’s head 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 50/50 Hybrid shell construction combines Endura-shell and in-mold shell constructions for wear-and-tear resistant durability and featherweight Performance Active ventilation with 8 vents, a total of 19 to let you easily fine-tune your temperature with open settings for maximum airflow, closed settings for locking in heat, and everything in between Fidlock snap helmet buckle Uses magnets to allow you to open and close the buckle with one hand even when wearing gloves Polartec Power Grid fleece on liner and ear pads is low pile, pill resistant, and moisture-wicking for maximum warmth Compatible with audio accessories Certification: CE 1077B & ASTM 2040 Anon Warranty All Anon products Are backed by a 1-year Warranty from date of purchase. Anon helmets Are also backed by a 2-year crash replacement policy.