●Why Full Face Replacement? - Covering both nose and mouth, effectively solving problems of dry mouth, brain fog, etc.(without memory foam) ●Snug Fit - It stays sealed without leaks and snaps in place as it should so as to prevent slipping. ●Ensure Wearing Comfort - Made of premium liquid silicone, softer and more comfortable than originals, it is latex-free and can be used all night without discomfort. ●Premium Material - It is composed of high-quality liquid silicone and PC material, making it more durable, sturdy, and not easy to break and rip. ●Compatibility - Only compatible with f20. And please replace it every 1 to 2 months for optimal performance. NOTE: This replacement should use with other original parts. Please kindly check the installation video on the product page if you need it.