product description 1.Keep your bed sheets in position. 2.Adjustable length- All straps are adjustable. Works with most types of bed sheets, fitted sheets, flat sheets ,mattress pads,sofa,table,baby's cribs and more. 3.Durability - Made of sturdy chrome metal clips and heavy duty wide elastic bands. 4.Protection -Built-in plastic clenching system does not harm fabric,Durable elastic and clamps are strong but will not damage the bed sheets. 5.Easy to put on Easy to put and keeps corners in place with minimal effort. Simply secure the bed sheet fasteners to the 4 corners of your mattress sheet. Slide it underneath the mattress, adjust the buckle for greater tension and firmly secure the 4 corners. Avoid the hassle of lifting heavy mattresses up or flipping it around