4 ply mask which is validated by Intertek. 1. 4-layer mask - It is made of a quadruple filter, so it has excellent blocking power. 2. 3D stereo shape - Provides smooth breathing and is really convenient when wearing makeup as the product never touches your mouth. 3. 3-layer folding design - Folding type design for easy storage. The original shape of the mask is perfectly maintained without ever being deformed 4. Strong nose clip for a tight seal - Mask never slides down, while also providing comfortable fit. 5. Highly resilient ear straps - It is comfortable for a long time using a soft, flexible material