JSP EVO 2 Helmet with Slip Ratchet Vented Blue The EVO®2 Comfort Plus™ helmet combines a super strong shell for superior all day protection in the widest range of environments, with the comfort benefits of the new Evolution® 3D Adjustment™ harness system. EVO®2 is a true evolution of the long established MK®2 and Mk®3 helmets. Packed full of the latest protection technology and features such as the Evolution® 3D Adjustment™ harness system and the unique OneTouch™ Slip Ratchet, which can be adjusted using one hand in a single swift movement.