Size: 26 cm (10.23 inch) * 13 cm (5.12 inch), it responds to most people's face shape. Soft and breathe well. It is comfortable enough not to rub your face, suitable to wear in anytime Suitable for wearing indoor household and outdoor travel, hospital, train, airport, street, and any other public places. Ideal for protecting you from Dust, Fog, Smoke, Ash, Pollen, Crafts, Gardening, Travel, Anonymity. Just enjoy a clean and healthy environment freely!