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Why Choose WoodyKnows Super Defense? - Cutting-edge electrostatic filter attracts 97% of pollen / dust / dander / mold, 90% of germs / PM2.5 pollution- Natural shape and soft material for comfort and fit- Drug-free protection, easy breathing, and discreet invisible designSelect the Right WoodyKnows Product Please review the product images above for guidance on how to differentiate Super Defense, Ultra Breathable, and Gas & Pollutant Reducing Nasal Filters. Caution: -Product image is only for your reference. Please kindly notice that the real product size may differ from that appeared on the image.Select Your Size I-R: XSmall round nostrilII-R: Small round nostrilIII-R: Medium round nostrilIV-R: Large round nostrilI-S: XSmall slotted nostrilII-S: Small slotted nostrilIII-S: Medium slotted nostrilIV-S: Large slotted nostril More from WoodyKnows - The size chart is offered in image part, however first-time buyers are recommended to order the multipack-(IR/IIR/IIIR) or multipack-(IS/IIS/IIIS)- Packaging Contents: 2 filter frames and 6 pairs of replacement filters, storage case, manual (2 pairs of replacement filters have been already installed into the frames so that you could use them directly)- Please search B00DKX0ZPY on Amazon for replacement filters.- Please search B00DLYR76M on Amazon for our latest Nasal Dilators for nasal congestion and snoring relief.- Please search B01CU25IY8 for WoodyKnows Super Soft Sleep Mask. Pure Air Wherever You Go!