This bed sheet holder set features heavy duty anti wrinkle straps made from reinforced ABS and PC materials with wide elastic tension to keep fitted sheets smooth and secure all night. Designed to fit all bed sizes including twin, full, queen, and king, it works with mattresses up to 11.8 inches thick and all fabric types from cotton to flannel. Simply slide the straps into place for a neat hotel style bed and improved sleep comfort with no tools or daily adjustments.