New Mask Spotlight
ResMed AirFit F40:
A New Standard in Comfort
An ultra-compact full face mask built for mouth breathers, side sleepers, and glasses wearers who want full face security without the bulk.
Updated July 2026 8 min read CPAP Mask Spotlight
For many CPAP users, finding a mask that offers both comfort and reliable performance can be challenging. Traditional full face masks often feel bulky, leave pressure marks, or restrict movement during sleep.
The ResMed AirFit™ F40 Full Face CPAP Mask was designed to change that. Featuring an ultra-compact under-the-nose design, an innovative AdaptiSeal™ silicone cushion, and a lightweight flexible frame, the AirFit F40 provides the security of a full face mask with the freedom and comfort of a much smaller design. According to ResMed, it's their smallest tube-down full face mask, designed to help users sleep comfortably in their preferred position.
What Is the AirFit F40?
A full face mask, reimagined smaller.
A minimal-contact full face mask that covers the mouth and the area beneath the nose — without sitting on the bridge of the nose.
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AdaptiSeal™ Cushion
Soft silicone with no hard components — adapts naturally to your face as you move.
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UltraCompact Design
Sits beneath the nose instead of over it, for a wider field of vision and less contact.
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Flexible Frame
A soft, fully flexible frame that moves naturally with your face through the night.
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Magnetic Clips
Headgear snaps securely into place — no need to readjust straps every night.
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QuietAir™ Technology
Gently diffuses exhaled air, helping reduce noise for you and your bed partner.
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Glasses Friendly
The under-the-nose profile makes it easier to read or wear glasses before sleep.
Why Users Choose It
Five reasons it's winning people over.
Each design choice solves a specific frustration with traditional full face masks.
Comfort
An innovative AdaptiSeal™ cushion
Made from soft silicone with no hard components inside the cushion, AdaptiSeal™ adapts naturally to different facial contours while maintaining a comfortable seal — even as you change sleeping positions.
Reduced pressure points Reliable seal
Compact
Ultra-compact under-the-nose design
Because the cushion sits beneath the nose instead of over it, users enjoy a wider field of vision, less facial contact, greater comfort, and reduced feelings of claustrophobia.
Wider field of vision Less claustrophobic
Flexibility
A soft, fully flexible frame
Unlike rigid mask frames, the flexible construction helps reduce pressure around the cheeks and keeps the mask comfortable throughout the night, moving naturally with your face.
Less cheek pressure Moves with you
Convenience
Easy magnetic clips
Putting on and removing the AirFit F40 is simple thanks to its magnetic clips, which allow the headgear to snap securely into place without needing to readjust the straps every night.
Quick to fit No nightly readjusting
Quiet
QuietAir™ vent technology
The integrated QuietAir™ vent gently diffuses exhaled air, helping reduce noise for both you and your bed partner — contributing to a more peaceful sleeping environment for couples.
Quieter nights Partner-friendly
Clinically Backed
What ResMed's studies found.
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96% of surveyed users reported freedom to sleep in their preferred position
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100% of surveyed users found the mask easy to use
Is It Right for You?
Who the AirFit F40 is best for.
It's an excellent fit for most full face mask users — especially these groups.
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Active sleepers who change positions often
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Users wanting a compact full face mask
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People who wear glasses before bed
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Those who want less facial contact
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The mask contains magnets — people with certain implanted medical devices should review the manufacturer's contraindications before use.
Featured Mask
ResMed AirFit F40
Full Face CPAP Mask.
Full face security in ResMed's smallest tube-down design — with the AdaptiSeal™ cushion and flexible frame that side sleepers and mouth breathers love.
AdaptiSeal™ cushion Flexible frame Magnetic clips QuietAir™ vent Under-the-nose design
How It Compares
AirFit F40 vs. AirFit F20
A side-by-side look at where the F40's compact design makes a real difference.
| Feature |
AirFit F40 |
AirFit F20 |
| Design |
Ultra-compact under-the-nose |
Traditional over-the-nose |
| Cushion |
AdaptiSeal™ silicone |
InfinitySeal™ silicone |
| Facial Contact |
Minimal |
More coverage |
| Field of Vision |
Excellent |
Moderate |
| Side Sleeping |
Excellent |
Very Good |
| Glasses Friendly |
Yes |
Less convenient |
Getting the Best Fit
Choosing the right size.
The AirFit F40 is available in multiple cushion and headgear sizes to accommodate a wide range of facial shapes.
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Use the official ResMed sizing guide
Measuring against the manufacturer's official guide helps ensure better comfort, fewer leaks, and improved therapy performance.
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Choosing the correct size matters as much as the mask itself
Even the AirFit F40's adaptive cushion performs best when paired with the right cushion and headgear size for your face.
Cleaning & Maintenance
A simple daily and weekly routine.
Regular cleaning helps maintain hygiene and prolong the life of your mask.
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Daily: clean the cushion
Wash with warm water and mild soap, then allow all components to air dry away from direct sunlight.
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Weekly: wash headgear and frame
Inspect the mask for signs of wear or damage while cleaning.
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Replace worn components
Replace cushions, headgear, and other components according to the manufacturer's recommendations to maintain optimal performance.
Many full face mask users struggle with comfort more than the therapy itself. The AirFit F40 was designed to overcome the biggest challenges of traditional full face masks — bulk, pressure marks, and restricted movement — while still delivering effective therapy night after night.
Shop the F40
Everything you need to get started.
Genuine ResMed parts, ready to ship across the UK.
Featured
Full Face Mask
ResMed AirFit F40
The complete mask system with AdaptiSeal™ cushion, flexible frame, and magnetic clip headgear.
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Most Replaced
Replacement Cushion
F40 AdaptiSeal™ Cushion
Keep your seal fresh and comfortable. Available in multiple sizes — replace regularly for best performance.
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Headgear
F40 Magnetic Headgear
Replacement headgear designed for the F40's magnetic clip system. Replace every 6 months for a secure fit.
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Accessories
CPAP Tubing & Accessories
Compatible tubing and accessories to complete your AirFit F40 setup.
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Frequently Asked
Questions about the F40.
Is the ResMed AirFit F40 a full face mask? +
Yes. The AirFit F40 is a full face CPAP mask that covers the mouth while sealing beneath the nose — combining full face security with a far more compact profile than traditional designs.
Is the AirFit F40 suitable for side sleepers? +
Yes. Its flexible frame and AdaptiSeal™ cushion are designed to maintain comfort and a reliable seal even when changing sleeping positions throughout the night.
Does the AirFit F40 sit over the bridge of the nose? +
No. The mask features an under-the-nose design, reducing facial contact and providing a wider field of vision compared with traditional full face masks.
Does the AirFit F40 have magnetic clips? +
Yes. It includes magnetic clips for quick and easy fitting and removal. Users with certain implanted medical devices should review the manufacturer's safety guidance before use.
The ResMed AirFit F40 combines innovative design with everyday comfort. Its ultra-compact profile, AdaptiSeal™ cushion, flexible frame, and QuietAir™ technology make it an excellent choice for users seeking a comfortable, reliable full face mask.
Whether you're starting CPAP therapy or looking to upgrade from a traditional full face mask, the AirFit F40 offers a modern solution designed to help you sleep more comfortably and stay consistent with your therapy.
Important Notice
The information in this article is provided for general educational and product guidance purposes only. It is not intended as medical advice or a substitute for guidance from a qualified healthcare professional or sleep clinician.
The AirFit F40 contains magnets. People with certain implanted medical devices, such as pacemakers or defibrillators, should review the manufacturer's contraindications and warnings before use.
Mask suitability depends on individual factors including breathing pattern, face shape, and prescribed pressure. We recommend consulting your sleep specialist or CPAP supplier before switching mask types.
Product features described are accurate to the best of our knowledge at the time of writing. Always verify compatibility with your specific CPAP device before purchasing.
