Help us celebrate our 10 years of creating superior technical riding gear with the F4 Anniversary Edition Helmet. Creating a level of comfort never felt before, the Klim F4 Helmet, with an unprecedented 41 aircraving intakes, is a new standard in helmet ventilation technology. It all starts with a design that more effectively channels air into the helmet where the EPS liner maximizes airflow over the entire head to dramatically cool the rider’s head. Safety standards havebeen exceeded not only through the use of aerospace materials, but also in the design. The F4 exceeds Snell M2000, M2005 and U.S. DOT standards.