Fangrui Product Details Extra Comfort: Headgear Strap For All Masks Pillow Cpap Mask Are Made Of Ultra-soft Premium Elastic Nylon To Provide An Ergonomic Grip Around Your Head For An Uninterrupted Full Night Sleep. Ultra-comfort Headgears: -made Of Premium Elastic Fabric To Its Comfort And Softness. Fits Comfortably To Promote An Uninterrupted, Full Night Of Sleep . Super Elasticity: -the Super Elastic Fabric Headgear Is Designed To Fit Snugly For Your Head. The Split Back Straps Can Be Widened Apart For A Looser Fit Or Narrowed Together For A Tighter Fit, The Gray Side Is Worn Facing Out, With The Blue Side Facing In, No Rough Feeling And Comfortable To Wear. To Use: -our Headgear Straps Are Great Soft And Flexible Pull-, It Is Made Of Premium Nylon To Long Time Use, Enough Material Provide Extra Durability, And With The Clips, You Can Adjust The Straps Length Easily According To Your Head Size. Easy To Care: -our Straps Is Easy To Wash By Using The Mild Soap, Rinsed Well, And Allowed To Dry Weekly. Do Not Wash Th Crafted With Attention To Detail