Size: Large. 1 Count (Pack of 1) OR 2Count (Pack of 2) Replacement Cushion Only. Sealed independent packaging. Compatible with Res_Med Air_Touch F20 Cushion Large Msk. Replacement Cushion for ResMed AirFit F20 or AirTouch F20 full face Cushion. Silicon memory foam cushion fit for the full face mask,please replace cushion every 3 months. F20 Memory Foam Cushion - No Air Leakage