Breathable and skin-friendly: Mouth guard mask can filter small particles from the air and protect you from fog, smog, dust, odors, vehicle exhaust and air pollution. These masks are soft, skin-friendly and breathable, ideal for people with skin sensitive allergies. Highly elastic and comfortable. Made of elastic material prevents suppression and feels perfectly in any face shape. Gentle wearing comfort that will not hurt your ears even if you wear it for a long time. It offers excellent protection. With stretchable elastic ear loops for a tight fit, the face masks prevent them from leaving marks on your face after taking off. They are easy to wear and take off.