Whether you're scaling new heights or exploring deep in a canyon, you can't let things go to your head. The Petzl Boreo Helmet - M/L is essential headgear to keep your head protected on any excursion. It's designed to offer protection on all angles of your head, while also being low-profile. This helmet includes a soft headband that conforms to your head shape for comfort. Large vents for airflow help you keep cool at every step of your journey, while foam liners offer comfort and stability so you can focus on the adventure.