Effective anti-wrinkle: Bed Sheet Holder reduces nighttime awakenings caused by wrinkled, loose, or bunched up sheets, allowing you to enjoy a restful night's sleep with ease Simple and Convenient Installation: Just fix the sheet holder at the corners of the mattress, arrange the sheets, and secure them with the strap. Once fixed, the sheets won't come loose Adjustable Height Feature: The adjustable side panels can reach up to 8.6 cm at the highest and 7.1 cm at the lowest. Bed Sheet Clips can be used on mattresses as low as 7 cm, providing flexibility to fit different mattress heights Rational Structure Design: This sheet corner fastener is suitable for most sheet types and sizes, even double layered sheets Simple and Elegant Appearance: After fixating Sheet Corner Holders, only a transparent fixing strap is visible outside, which meets the aesthetic preferences of most people nowadays