This 2 layered mask is made from a breathable woven cotton blend, which doesn't restrict breathing and can filter up to 74% of particles as small as .1 microns (without any additional filtration in slot). This personal face mask is a a light weight solution that doesn't use a metal nose adjuster. Features:Reusable & machine washableLightweight with elastic ear loopsFilter slot to add in additional filtration* Tapered sides for closer fitOne size fits all - may be tight on large heads or elastic can be tied off for smaller headsMachine washable - should launder before first use2.75" H x 8/14" nose x 7 1/8" chinMade in USA IMPORTANT:- This mask is NOT a certified N95 respirator, it is for non-medical use only- This mask does qualify as "cloth face coverings" as Recommended by CDC. - This mask does not reduce the need for social distancing- Want to save some money? Make your own with CDC DIY Mask Instructions.Survival Frog has donated over 8,000 N95 NIOSH masks (over $40,000) to hospitals and smaller clinics. Survival Frog will not be selling medical grade masks to consumers until medical facilities have enough N95 masks in stock. *Additional filtration: Filter not included. Coffee filters or vacuum bags made of HEPA polypropylene (not fiberglass) are good DIY filters that can be slid into the filter slot found on this mask. Or you can wear without any additional filtration.