|PACKAGE CONTENT| 3x Replacement Urban Air Filter 2.0. |DURATION| Our replaceable filters last for about 100 hours, but we advise to change every second week. |4 SIZES| The ergonomic shape of these filters will fit all face types and will feel comfortable against your skin. Choose the right size to match your Urban Air Mask 2.0 size. |ANTI-FOG| 3D memory nose-foam & shapeable nose-clip for minimal air leakage. |5 LAYER FILTER TECHNOLOGY| The Urban Air Filters 2.0 are compatible with Airinum Urban Air Mask 2.0. Each filter provide superior protection thanks to the 5 layer filter technology against different external agents, smog, pollens.