MIPS Technology: Reduces rotational forces during impacts; Durable Construction: The EPS hard foam liner is fused with the outer shell under high pressure and strong heat for a lasting connection; High Visibility: Reflectors and LED lights with 180* visibility provide high visibility to the bike helmet, making it easy for others to spot you in low-light conditions; Turn-Dial Adjusting: The Zoom Ace adjustable system ensures a snug and comfortable fit with a simple turn of the dial that adjusts the helmet height to the circumference of the head; Air Vents: 4 air inlets and 9 air outlets maximize airflow to keep you cool and comfortable on your rides