The IRH Equi-Fit Graphic Helmets feature the Dial -Fit-System for easy fitting and Cool-On Lining for comfort. To fit the helmet, simply turn the dial at the back of the helmet and you instantly have a custom fit. The removable and washable Cool-On-Lining is a Hi-Tech, soft, fast drying lining that pulls moisture away from your head to keep you cool and comfortable while riding. While safety is at the forefront of all IRH Helmet Designs, IRH has also paid close attention to the comfort and style of each helmet. They have incorporated the IRH front vent design geometry that is on all IRH Elite Model Helmets. IRH decided to incorporate their Elite Front Vent because it has proven to be extremely effective in allowing fresh air to enterthrough the front and circulate over the top of your head creating a cooling of your head. ASTM F1163-15.