OK, what are KF94 masks, exactly? The "KF" stands for "Korean Filter," Sara Andrabi, MD, assistant professor of emergency medicine at Baylor College of Medicine, tells Health. "The '94' represents the filtration efficiency, which means how good the mask is at filtering out particles. In this case, that is 94%." ⬛ Product Specification and Introduction ◾Size: About 20CMx8CM ◾Applicable: Adult ◾Package Content: 10 pcs/ Pack ◾ Fishtail design with 4 layers Non-Woven, Melt-blown Face Mask ◾Feature: 4-PLY CONSTRUCTION: This mask is soft and the NON-WOVEN multi-layer construction allows for an easy and comfortable feel and secure fit. ◾ Allergen-free- Made of hypoallergenic materials, adjustable nose clip, adjustable elastic earloops for a comfortable fit. ◾Helps guard against pollen/allergens so you can breathe comfortably. ◾ LIGHTWEIGHT and FOLDABLE: This lightweight mask allows for folding and easy portability. The flexible nose guard is designed to provide a custom fit. Adjustable ear loops with stretchable braided ear bands to ensure comfort over long periods of wear time. ◾BETTER PROTECTION: This mask is designed to offer more protection than a standard disposable 3-Ply mask. 4 Layers of protection include a Non-Woven Inner Layer, Meltblown Filter, Hot Air Cotton Filter, and Non-Woven Outer Shell. ◾COMFORTABLE FORM FITTING DESIGN: Masks have a 3D flat-fold(tri-fold) design that prevents air leakage. Use the nose bridge The adjustable nose bridge helps to ensure a secure fit and stays on your face without slipping or falling off. The perfect fit prevents fogging up your glasses. ◾Disposable Face Mask Great for School, Outside, Beach, Supermarket, Restaurant, Travel, Shopping and more for Adult. It is the best gift for you and your baby. Can protect the entire face-shaped structure, installation and operation are very simple and convenient. ◾Functional nose support design" to prevent fogging and isolate external air 3 kinds of structure design" for long-term wearing and comfortable skin Elastic band earhook, easy to stretch and wear 180 ° air permeability Material: Non-woven, melt-blown.