Wide Compatibility: Bed sheet retainer straps fit various sheets, it can be used on bed sheets, sofa cushions, mattress protectors, tablecloth covers, seat covers of chair/car/motorcycle, ironing board covers and more. Easy to Use: Easy to put on and keeps sheets in place and no more fixing sheets, adjustable length allows for desired tension; the wider elastic provides a stable and stronger grip for intensive use; fitted bed sheet. and mattress cover fixing system. Adjustable Length: Set of 4 triangular fitted sheet clips made with durable elastic bands and the unique cord lock to allow the desired tension. Improved built-in nylon "clips" and nickel-plated grippers hold sheets firmly in place. Durable and Practical: The bed sheet clips are made of sturdy metal clips and sturdy elastic cords that grip your bed sheets tightly and are not easy to break.