Cleantop certified KF94 adjustable masks. Available in Adult & Kids sizes. Adjustable nose-bridge and earloop design also perfect for those with glasses. Adjustable earloop design allows for a perfect fit - there are clips on the front of the masks that you can use to adjust the earloops KF94 Rating Certified by government of South Korea Made in South Korea Individually sealed for highest hygiene standards and product safety 4-Layers of highest grade materials for >94% filtration of harmful particles Lint-free materials fit ergonomically around contours of the face Ultra-soft, non-irritating to skin Excellent breathability for all-day wear 10 masks individually sealed 100% Authentic Guarantee Buying Options: Adult - White & Black (BROWN PACKAGING) - 10 Pack, individually sealed Kids - White & Black (BLUE PACKAGING) - 10 Pack, individually sealed Size Guide: Adult - perfect for regular/medium size faces. Kids - fits ages 5-13. KF94 is the South Korean certified equivalent to the N95 and the KN95 masks. NIH Study on Effectiveness of KF94 and N95 masks. This product not eligible for returns.