ADJUSTABLE ATTACHMENT KEEPS WEDGES IN PLACE: The excellent adjustable bed sheet attachment allows for your desired tension. Giving great flexibility to adapt to all beddings of different sizes. It effectively avoids elastic slippage. Material: The elastic ties are made of sturdy metal clips and sturdy elastic cords, which will firmly grip your ironing board or ironing sheets and won't break easily. L The wider elastic offers a stable and stronger grip for intensive use. The integrated plastic clamping system protects the fabric from damage. Quite easy to attach and keeps the corners in place and no more fighting with the sheets at night. Easy to install: just open the metal clips and place the three sides in the desired places (on a corner of your bed sheet) for a good fit. This will ensure that your laundry does not wrinkle or move to one side over time. Perfect for futon, split mattress bed, air mattress, foam mattress, top mattress- cushion and can also be used on tablecloth covers, grill covers, car/boat/motorcycle/scooter seat covers, sofa/chair seat covers and more.