The ARS Fit System enables progressive fit adjustment via a thumbwheel. It distributes pressure evenly around the head, eliminating hot spots and pressure points. The adjustable head basket is ponytail friendly. Thirty-one vents with internal air channels promote excellent airflow.Awarded the esteemed Virginia Tech 5-star “Best Available” protection rating, you can trust that the Z1 MIPS is a great choice for your head. MIPS protection helps reduce the risk of rotational injury. T-Pro temple protection provides additional coverage at the temples. In the event of a crash, an internal polycarbonate cage keeps the foam together, offering better protection from successive impacts.Add-on features offer further functionality, including the optional Aeroshell and a rechargeable Rear Z-LED light.The Z1 MIPS weighs just 275 grams.