The North 7700 Series is the most comfortable half mask respirator available today. The face piece is made of soft, non-allergenic silicone. Since silicone is so much more flexible than organic rubber, it conforms to a worker's face. Three face piece sizes make it much easier to fit your workers. The North 7700's cradle suspension system also adds to the comfort of this respirator. It doesn't slip like respirators with conventional strap systems. The cradle suspension gives an even seal without creating pressure points. The low profile of the North 7700 gives workers a wide field of vision and room for protective eyewear. Its low inhalation and exhalation resistance makes breathing easier, leaving more energy for production. Easily converts to a PAPR or Supplid Air system. 42CFR84 Approved. Complies with OSHA Standards.