Securely installs to the exterior of the helmet within seconds Creates a barrier from the elements to keep you warmer and drier in inclement weather Does not interfere with exterior size adjustment of the helmet Increases aerodynamic performance Rolls up and fits in your jersey pocket when not in use Keep the rain, snow, and mud from getting inside your helmet, or use as a quick aerodynamic solution to close off the front and side vents. Aeroshell is a great accessory for compatible Lazer helmets!