The Refresh Mask N95 Personal Purification System provides the highest protection level without compromising comfort. Built with medical-grade silicone that seals to your face for a comfortable fit. The built-in air circulation system pulls in fresh air while helping to remove CO2, heat, and moisture from inside the mask, keeping you cool and refreshed. It also features N95 rated filters to protect you from 95% of particles 0.3 microns in diameter. That includes harmful particles like dust, allergens, bacteria, pollution, and viruses. The N95 grade filters are replaceable and disposable, allowing for re-use of the mask. This mask is rechargeable via micro USB for up to 8 hours of runtime.