How do you know what size to buy?

Image 2 has a sizing chart but the preferred method is definitely buying the trial sizing pack initially to determine fit.

Do these help with perfume?

I never tried the nose filters with perfume but I would be skeptical. They are hard to put in your nose and they block your nose from getting air. I bought them to reduce pollen when I was cutting my lawn. I found myself breathing through my month instead of my nose. They also have a tendency to fall out. Hope this helps

Does it filter the flu virus?

i believe that it might minimize the virus from entering your body. It will definitely help rather than not.

Could these reduce the inhalation of chlorine in swimming pools?

These answers Lolol. I believe the asker is questioning if they will filter chlorine vapors from the air NOT the water. The answer is, it is unlikely. It takes a filter with a smaller micron filtering capability to filter things like vapors in my experience. It might help, but doubtful it would completely eliminate.

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Description

🌿 Elevate your breath game—stay fresh, focused, and unstoppable!

COMFORT MEETS PERFORMANCE - Latex-free, surgical-grade plastic molds perfectly without heat or fogging glasses.
BREATHE CLEAN LIVE FREELY - Advanced 3M filtration blocks pollen, dust & smoke for all-day protection.
TAILORED FIT FOR EVERY NOSE - Five sizes included in trial pack ensure a custom, secure fit for maximum effectiveness.
ANYWHERE ANYTIME PROTECTION - Ideal for work, travel, and crowded spaces—your discreet defense against airborne irritants.
SILENT NIGHTS REFRESHED MORNINGS - Clinically backed nasal dilation reduces snoring for better sleep quality.

O2 Nose Filters utilize cutting-edge 3M electrostatic technology to filter particles smaller than 2.5 microns, providing effective protection against pollen, dust, smoke, and allergens. Designed with soft, surgical-grade, latex-free plastic, they ensure all-day comfort without heat buildup or fogging glasses. Clinically shown to reduce snoring by widening nasal passages, these filters come in five sizes for a personalized fit, making them perfect for daily use in diverse environments from busy airports to pollen-heavy outdoors.