WoodyKnows Ultra Breathable Natural Fit Nose / Nasal Filters • Reduces exposure to pollen dust pet hair & dander and mold • Offers relief from nasal allergies allergic asthma rhinitis sinusitis • Designed according to the natural shape of your nostrils for comfort and fit with soft medical-grade plastic BPA- and Phthalate-free • Ultrathin (0.04mm) filter single layer woven nontoxic mesh • Drug-free protection reusable for up to 30 days per filter with proper care Why Choose WoodyKnows Ultra Breathable? - 95% pollen filter efficiency no side effects - Ultra breathable with world-leading ultrathin (0.04mm) filter the mesh thread is as slender as 0.018 mm - Discreet invisible design - Natural shape and soft material for comfort and fit - 0.5 cm away from the sensitive nasal mucosa - Drug-free protection Select Your Size I-R: Child or very small adult nose round nostril I-S: Child or very small adult nose slotted nostril II-R: Small adult nose round nostril II-S: Small adult nose slotted nostril III-R: Medium adult nose round nostril III-S: Medium adult nose slotted nostril IV-R: Large adult nose round nostril IV-S: Large adult nose slotted nostril Comparing Super Defense Filters with Ultra Breathable Filters Ultra Breathable nasal filters efficiently block medium-sized particles like pollen and PM 20 dust with ultra-clear breathability. Super Defense nasal filters go further to block even smaller and arguably more hazardous PM 2.5 particles with very good breathability. Instructions for Use - Insert filters into nostrils then it fastens on nasal septum - From side view the filter should maintain a slanted position in the nose - The central connector of the filter is adjustable to ensure a secure fit and seal in your nasal passage. If you find that this connector is too tight for comfort you may gently pull both sides apart to stretch and loosen it Others - Packaging Contents: 1 filter manual storage case Woody Knows Your Nose!