Smart, Adjustable Design: For the perfect fit, these straps are adjustable to suit any head size. They ensure there are no air leaks and remain strong without loosening easily. Optimize this accessory for the best treatment. Superior Comfort: Created with first-class stretchy, skin-friendly fabric, these straps provide comfort. Their soft nature eliminates any rough sensation, making them ideal for sleep and comfortable to wear in any sleeping position. Perfect Replacement for F20: These straps are specifically engineered for your F20, ensuring peaceful and restful sleep. They provide a snug, reliable fit throughout the night, serving as an invaluable replacement for head straps. Premium Quality and Durability: The replacement headbands can be easily cleaned by washing under running water, rinsing, and drying naturally. They maintain their quality without fraying, curling, shedding, delaminating, or degrading. Color: Gray + Blue Material: Polyester Package Contents: 2 x CPAP Straps Only the above package content is included; other products are not. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allows for an error of +/- 1-3cm.