Style and Performance The Tempo KinetiCore provides comfort and style. One size is all you need with this helmet. The helmet is equipped with the Lazer TurnSys system for an easy to adjust fit while on the move. Features: Easy vertical adjustability: The Lazer Turnsys system provides a tailored fit that's easy to adjust on the move with a simple turn of the dial Guaranteed fit: One size fits all. The helmet shell and fit system is designed to accommodate a wide variety of head sizes and shapes LED light compatibility: Increase safety and visibility by attaching the Universal Lazer LED at the rear of the helmet via the Direct Mount Lightweight: 22% lighter than Lazer Compact M CE Reduced plastics: 80g less plastics used than in Lazer Compact M CE Size: Uni-size 54-61 cm Rated 4/5 stars by Virginia Tech* *Since 2011 Virginia Tech have been providing unbiased helmet ratings that allow consumers to make informed decisions when purchasing helmets. Their impact tests evaluate a helmet's ability to reduce the linear acceleration and rotational velocity of the head resulting from a range of head impacts a cyclist might experience. Helmets with more stars provide a reduction in concussion risk for these impacts compared to helmets with fewer stars.