The Pfanner "Protos Integral System" can be changed within seconds to be used for construction, forestry, arborist work, or climbing operations. The chin strap, visor, neck protection shell, and ear protection are all integrated and yet at the same time modular items. Thanks to the strongly gripping neck protector, the helmet sits perfectly even while working at an angle or upside-down and gives you a safe hold. The Protos arborist helmet from Pfanner is the most advanced helmet system available on the market offering the best energy absorption, lightest weight, and unprecedented breath-ability. The side impact protection sets it apart from its competitors and makes it arguably the safest climbing helmet ever brought to market. NOTE Protos helmets are now made with a grey foam insert, NOT the green koroyd included with earlier versions of the helmet