Keep Sheets Tight and Wrinkle: Made of durable ABS material, this 4 piece set includes four transparent lock strips. Reusable and longlasting, these bed sheet holders grip the corners to prevent slipping and wrinkling, keeping a neat, smooth sleep surface all night. Secure Fit for Undisturbed Sleep: The fitted sheet corner holders use nonslip lock strips and strong tension to eliminate sheet bunching and shifting, so you wake up to clean bedding instead of a messy bed. Universal Fit for All Mattress Sizes: Designed to work with all bed types—single, twin, queen, or king—and with all fitted sheets or mattress protectors, this 4 piece set provides broad compatibility. Quick Installation and Tool: No complex setup required—just insert and lock. These fitted sheet holders install in seconds without damaging sheets, making bed making effortless. Use scenarios: Ideal for restless sleepers or pets that pull at sheets, helping corners stay secure and the sleep surface smooth throughout the night. Suitable for thick or multilayer bedding, such as heavy blankets, where corners tend to lift or wrinkle. Convenient for guest rooms or households with multiple mattress sizes, where quick, tool installation and reliable fit simplify switching sheets between beds.