Replacement Headgear Straps Double Layers High Elasticity Breathable Head Band for AirFit F20 Applicable Model: The replacement headgear straps are compatible with ResMed AirFit, AirTouch N20; please check your device model before ordering. Prevent Strap Marks: These headgear straps help reduce the occurrence of strap marks and provide a soft, comfortable feel. Regular replacement is recommended for best performance. High Softness: These head straps are designed to offer extra softness and stability, making them easy to adjust and comfortable to wear. Double Layered and High Elasticity: The headgear straps feature a double-layered design and high elasticity for improved support and a secure fit. Breathable Material: Made from breathable fabric that ensures comfort and is gentle on facial skin, minimizing irritation during use.