The low profile 7700 is suitable for a wide range of applications due to its high level of comfort and optimum fit factor. The ergonomically designed seal and one size adjustable head harness ensures optimum fit for guaranteed user acceptance. Contoured revert seal offers a wide sealing surface which will not cause discomfort. Zip lock seal bags for re-use ensuring respirator remains clean and fresh. Silicone elastomeric face piece, highest quality, supersoft hypo-allergenic. A streamlined head harness with no loose straps after adjustment.