Haven't worn it yet but it fits well. I went to the Respro website and filled out their questionnaire, asking them to measure your face and head a specific way. They also ask about weight, gender etc. I did this and got a reply the next business day with a size recommendation. This is an English company and their website has many more options and accessories. I bought a few things including a clip on the strap to secure the fit higher on my head. I didn't need their insert which fits snugly on the mask if it's too big for you. My mask fits well but I bought straps in case I need to adjust the fit. I'm leaving soon and haven't had time to exchange if I'm having trouble boarding. They ship for free and I received the package from USPS in about 4-5 days. I am a slim woman with a head circumference of 22 inches. Medium fits perfectly. Some may need to lengthen the velcro, which seems possible by purchasing an extra length of velcro.
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