Highly stretchy elasticized straps, these sheet straps clip onto sheets in 3 positions and add tension to hold sheets under your mattress Unlike other sheet straps, which feature an inner clip in the shape of a triangle, these are in the shape of a circle, making them more durable, strong and resistant to snapping or breaking; innately durable design to last for years ​Also works for tablecloths, sofa covers, and various chair fabrics Staps can adjust from 9.5 to 13.5" in length.