Sleep in comfort: the bed sheet holders are very easy to attach and the clips hold even under tension. As they can be adjusted in length, you could adjust it perfectly to fit the underlay, blanket, sofa or playpen. Never worry about messy bed sheets again! Finally, there are no wrinkles that rob your sleep. Extension system: Elastic bands of each bed sheet tensioner made of nylon, which have good elasticity and smooth texture. Triangle is more stable than other shape. Durable clamps design: robust clips made of chrome-plated metal, the built-in plastic clamping system not only keeps your bed sheets firmly, but also protects the fabric of your bed sheets from damage. Multi-purpose: our mattress holders can also be used as elastic tensioners for tablecloth covers, grill covers, car seat covers, boat covers, motorcycle covers, scooter seat covers, sofa seat covers, chair covers, etc.