– The three-layer structure with excellent dustproof effect cuts pollen, dust, and virus droplets by 99%. – You can use it for prevention such as cold measures. – Since the space around the mouth creates a comfortable space, it relieves suffocation and makes breathing easier. – Uses flat rubber, which is a soft material that does not hurt your ears. – Optimal size for small children. – Target age 4 years and over (Size: length 11 x width 17.5 cm)