Nano Breathable mask is marketed in 10 pcs package and eliminate your needed to buy mask for a long time. Dimensions are standards and suitable for general usages. you'd better change your mask once 2-3 hours.
Three-dimensional design, which conforms to the contour in all directions
Three-layer filtration to block fine particles in the air
high elastic ear strap, comfortable size and light weight does not bother ears
Tightly weld, firmly prevent detachment and resist pulling.