It needs to be replaced every few months. for ResMed Airfit p10 headgear. Super comfortable headwear: Made of high-quality elastic fabric to ensure comfort and softness. Comfortable and close to your body, help you have an uninterrupted sleep all night. Super elastic:-Super elastic fabric headgear designed to fit your head. The split straps can be separated to be looser, or squeezed together to be tighter, with the gray side facing outwards and the blue side facing inward. There is no rough feeling and is comfortable to wear. Durable: Our headband is very soft and elastic, with strong tensile strength, made of high-quality nylon to ensure long-term use, and enough materials to provide additional durability; Easy to care:-Our shoulder straps are easy to wash with mild soap, rinse well, and allow to dry weekly. Do not wash the headgear with a washing machine or dishwasher. The headgear should be replaced every 3-6 months to ensure that it fits and seals every time you use it. Material:nylon colour:Blue/Gray Package Contents: 3 x headbands 6 x buckles Only the above package content, other products are not included. Note: Light shooting 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.