Adjustable elastic design: The length of the adjustable single shoulder strap can be adjusted, the shorter one can be adjusted according to your needs. 9cm, the longest can be stretched to 25cm, suitable for different family needs. The Unlimited Sheet Stretcher is suitable for single or double sheets, mattress covers, sofa covers, board covers; irons, ironing boards; ironing, tablecloths, car seat covers, chair covers, etc. The bed sheet tightener is suitable for single or double sheets, mattress covers, sofa covers, skateboard covers. irons, ironing boards; ironing, tablecloths, car seat covers, chair covers, etc. The fixed bed is made of high quality nylon and stainless steel. and have a built-in plastic pressure system; which will not damage the fabric. Durable, anti-corrosion and wear-resistant. Anti-rust. Stable fixed triangles are more stable than other shapes. The triangular support keeps your sheets taut every day without you having to do it. Re-adjust every night1. Adjust the