* 3PCS Xiaomi Smartmi Anti-Pollution Air Sport Mask.
* Comes from Xiaomi Eco-chain.
* Skin-friendly Soft memory TPU, Free to breath.
* Isolated from air dust, PM2.5, Haze, pollen grain, automobile exhaust.
* You can adjust hook length M size: nose to ear 180mm*135mm (for Head circumference 53mm-55mm) L size: nose to ear 195mm*138mm (for Head circumference 56mm-58mm)
* With the ventilating value, the mask is safe and comfortable to wear.