ResMed AirFit F40 AdaptiSeal™ Replacement Cushion
Give your AirFit F40 its signature “barely‑there” feel again with a fresh AdaptiSeal™ cushion. Unlike traditional full‑face parts that ride up the bridge of your nose, this minimalist under‑the‑nose cushion forms a soft pocket around both nostrils and seals beneath your lip, leaving your entire field‑of‑vision clear for glasses, books, or late‑night streaming. Three flexible silicone zones—feather‑light at the nasal bridge, supportive at the cheeks, and adaptive at the chin—let the cushion conform as you shift positions, maintaining an airtight seal at pressures up to 30 cm H₂O without overtightening the headgear.
 
The all‑silicone construction contains no rigid inserts, so it drapes naturally against your face and pillow, dramatically reducing red marks and morning “mask face.” Integrated micro‑vents diffuse exhaled air in 360°, making the F40 one of the quietest full‑face options ResMed has ever released. Whether you’re side‑sleeping, stomach‑sleeping, or napping in a recliner, the AdaptiSeal cushion flexes with every movement so therapy remains comfortable—and effective—all night long.​
 
Swap sizes with zero fuss: Small Wide (#64627), Medium (#64628), and Large (#64629) cushions all snap into the same F40 frame, letting you refine fit or share a mask frame with a partner. ResMed recommends replacing the cushion every 30 days (or sooner if you notice leaks or discoloration) to keep your sleep apnea therapy performing at peak levels.​