The Original New and Improved Sheet Suspenders ( grippers, fasteners,holders) Brand Mini's. More Adjustable than a Band. Thickest elastic, strongest clips nothing comes close Keeps bottom sheets on all mattresses, even hospital beds, hide-a-beds, adjustable beds, inclining beds, baby's cribs and odd shaped mattresses such as those found in RV's Used in luxury hotels, yachts and cruise lines around the world. 4 straps, one used diagonally for each corner of the bed Higher quality/longer life than shock cord (bungee) type cross corner products