Hold-Up Brand Adjustable Sheet Mattress Corner Straps with Patented Gripper Clasps Made in the USA Usa Made Cotton Poly-blend Elastic Hand Washable Fabric Made in USA Attaches diagonally across any size mattress fitted sheet corners regardless of then mattress thickness Top quality sheet strays with U.S. Patent #8429773 featuring our exclusive hook and loop length adjustment system and Patented Gripper Clasps that hold tighter the harder you pull on them BONUS: Simple one person installation requires NO LIFTING of mattress and works great on powered hospital beds to hold bottom sheets in place Patented Composite Plastic GRIPPER CLASP will holdup to years of use as the USA made poly-blend elastic corner straps which are hand washable Works on any size fitted Mattress sheet from twin to California King and attaches across the corners in seconds. Great on motorized hospital or adjustable beds