100% Silicone hypoallergenic face piece: Extra comfort. Single unit four-point harness with neck strap: Easy to use, its ergonomic design and improved suspension system fits perfectly on top of the head providing a high level of comfort. Reduced dead air space: less re-breathed exhaled air. Quick to dismantle and clean, with replaceable parts: Easy maintenance. Superior exhalation valve allows more breath to be exhaled: Workers feel cooler and more comfortable. Variable thickness in sealing area conforms to nose bridge: improved comfort and fit. In combination with this half face mask, the following filters can be used: N Serie Dust Filter P3 (N06575008), N Series Gas Filter A1 (N06575001L), N Series Gas Filter K1 (N06575004L), N Series Gas Filter ABEK1 (N06575009L), N Series Combination Filter A1P3 (N06575081L), N Series Combination Filter ABEK1P3 (N06575089L).