1Applicable Model: The replacement headgear straps are replacement for ResMed AirFit, for AirTouch N20, please check the model before ordering. 2Prevent Strap Marks: These headgear straps help prevent the occurrence of strap marks and a plush feeling, ensuring comfortable usage. Regular replacement is recommended for optimal performance. 3High Softness: These head straps are specifically designed to provide extra softness and stability, making them easily adaptable and comfortable to wear. 4Double Layered and High Elasticity: The headgear straps feature a double layered design and high elasticity for added support and a better fit. 5Breathable Material: The replacement headgear straps are made of breathable material that provides comfort and does not cause any allergic reactions when in contact with facial skin.