Smart, Adjustable Design: Custom made for the perfect fit, these headgear straps are adjustable to suit any head size. it ensures there are no air leaks and remains strong without loosening easily. Optimize this accessory for the best sleep apnea treatment. Superior Comfort: Created with first-class, lightweight, stretchy, skin-friendly fabric, these headgear straps provide comfort. Their soft nature eradicates any rough sensation, making them Perfect for sleep and comfortable to wear in any sleeping position for sleep apnea patients. Perfect Replacement for F20: These headgear straps are specifically engineered for your F20, ensuring peaceful and restful sleep. They provide a snug, reliable fit throughout the night, companying as an invaluable replacement for the head straps of sleep apnea patients. Premium Quality and Durability: The replacement headbands can be easily cleaned by washing under running water, rinsed and dried naturally. They maintain their quality without fraying, curling, shedding, delaminating or degrading in any other forms. Colour:gray+blue Material:Polyester Package Contents: 2 x CPAP Headgear 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.