• Includes 4 covers for positive pressure masks, designed to reduce pressure and red marks on the cheeks, improving sleep quality. • Made with high-quality materials: nylon and spandex, which are soft, elastic, and capable of absorbing sweat and body oils. • Washable and reusable, easy to clean with water and detergent, and air dry to prolong their lifespan. • Compatible with F20, F10 masks and most full-face masks in medium or large size. • Product dimensions: 40x36 mm hole diameter; 10x11 cm diameter when flat.