The Allegro Nova 2000 is engineered with U.V. stabilized and abrasion-resistant high-density polyethylene. This super-tough helmet shell meets penetration requirements of ANSI 289.1, while also offering premium comfort with its lightweight, multi-layered sound-deadening foam padding, Velcro-mounted for easy removal and cleaning. The large double lens, with optional tear-out lenses, allows for optimum vision without irritating side glare, and the inner lens complies with ANSI standards for impact resistance. The air duct distribution diffuses breathing air evenly throughout the helmet, with the added benefit of preventing the viewing lens from fogging. Helmet includes low pressure constant flow valve. The outer cape is secured by eight snaps sealed with an abrasion-resistant butadiene band, preventing abrasives from rebounding and entering the helmet. The detachable inner cape provides a barrier to airborne contaminates and is made of soft, breathable fabric to allow air flow down the neck, while maintaining positive pressure. Tough but lightweight nylon cape. Helmet is NIOSH-approved. A ¾ hp ambient air pump (one-worker) and 50 foot breathing air hose complete the system. Sold by the each system.