As part of our ongoing development of the Whole Helmet Concept™, POC has added MIPS to all of our mountain helmets this year. MIPS also enhances the following functions: The in-mold construction combines a flexible EPS liner, a highly impact-resistant PC (polycarbonate) shell, and a durable ABS top shell to provide all-day comfort and safety. The adjustable sliding ventilation system provides excellent ventilation and comfort, and the ventilation holes on the front of the helmet allow air to efficiently enter the goggles, preventing fogging inside the lens. It features a dial-type size adjustment system at the back of the head, and you can find the ideal fit by replacing the internal padding. Pair with compatible POC goggles for a perfect fit