Smart, Adjustable Design: For a perfect fit, these headband straps are adjustable to fit all head sizes. It ensures that there are no air leaks and remains strong without coming loose easily. Optimize this accessory for the best treatment. Excellent Comfort: Created with premium, stretchy, skin-friendly fabric, these headband straps provide comfort. Their soft nature eliminates any rough feeling, making them perfect for sleep and comfortable to wear in all sleeping positions for patients. Perfect Replacement for F20: These headband straps are specifically designed for your F20, ensuring a peaceful and restful sleep. They provide a comfortable, reliable fit all night long, as an invaluable replacement for headbands for patients. 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, folding, delamination or deteriorating in any other way. Color: gray+blue Material: Polyester Package Contents: 2 x CPAP Headband Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.