CL-15 Session Helmet Two-piece channeled Dual-Density EPS liner Large eye port opening for greater visibility Unique CAD generated shell sculpture (with 3 shell and 4 EPS sizes) for exceptional fit and increased helmet stability 2 multi-stage forward intake vents and a large integrated rear exhaust spoiler are combined with sculptured air channels to allow the entire helmet to act as a full venturi exhaust system. Fresh air is channeled at high velocity through this system (front to back) which draws heat and humidity up and out of the shell through 4 internal exhaust channels