Fangrui Product Details Secure And Stay In Place: These Bed Sheet Holders Are Designed To Slipping And Wrinkling, Ensuring A Tight Fit Against Mattress Corners. Ideal For Thin Mattresses, They Are Not Recommended For Thick Mattresses, Adjustable Beds, Or Silk Sheets. Enhanced Grip With Anti-slip Particles: Equipped With Anti-slip Particles On The Bottom And Outside, These Bed Sheet Holder Straps Securely Grip The Sheets Without Being Overly Tight Or Difficult To Remove, Providing A Hassle-free Sleeping Experience. Effortless One-time Installation: Easily Install These Bed Sheet Fasteners Without The Need To Lift Or Flip The Mattress. Once Set, They Maintain A Firm Hold On Your Sheets, Simplifying Removal And Reinstallation During Laundry Days. Universal Compatibility: Our Adjustable Bed Sheet Grippers Are Designed To Fit All Mattress And Bedsheet Sizes. Under The Bed Once Installed, They Work Effectively With Twin, Double, Queen, And Other Bed Sizes. Gentle On Fabrics: The Corner Fitted Sheet Holders Are Crafted From Soft Mater