Check the listing for details. Mask 5667 with Valve and Filter Black Large. Color: Black, Condition: Open box. Listed at 28.00 USD. New, open box face mask 5667 with Valve Color is Black Size is Large This was opened and taken out of the box and bag to take the pictures of the style and pattern, but was never used. Covid free home. Box shows some wear due to storage. Please see all pictures for reference and brand before purchasing. Vmask is the world's first stylish, high efficiency, well-fitting, comfortable and reusable filtering face mask. The mask’s advanced microfiber filtration fabric filters an average of 99% of particulate matter, such as PM2.5 particles, haze, dust, germs, pollen, and other airborne contaminants. It meets US FDA 42 CFR requirements for N99 rating, meaning their performance surpasses that of an N95 mask. Vmask come in sizes suitable for babies, children, teens and adults. They require no filter changes, and can beused for hundreds of hours without replacement. The masks are designed in the US, and manufactured in Korea. Sizing: S: 25-50 lbs / 11-22 kg M: 51-120 lbs / 23-54 kg L: 121-200 lbs / 55-90 kg XL: 200+ lbs / 90+ kg Additional note on Sizing : In our experience, "L" fits most adults and older teens. "M" is suggested for bigger kids aged 7+, tweens/small teens and petite ladies. "S" fits most tots 3-7yrs, although do note some larger 6 yr old boys graduate quickly to "M". XS does not come with a comfort exhale valve and fit babies aged 0-2. The next size up, with valve, is "S" for tots approx 11kg and up.