The Insurgent spherical helmet provides superior protection, comfort and confidence that you need when descending your favorite trail. This full face helmet combines an EPS outer layer and an EPP inner layer , forming a spherical structure, known as spherical technology to control the impact force during an accident. Insurgent Spherical is designed like this to keep your head as cool as possible even during the hottest trips thanks to the use of optimized air intake openings internal ducts and stack ventilation for increased cooling capacity.