Sheet Stays - Set of 2 Criss Cross Fitted Sheet Fasteners (i.e. Sheet Grippers) for One Bed of Any Size Sheet Stays are the perfect fitted bed sheet fastening system! Unique criss cross design makes them easy to install with one person without lifting the mattress. Fits a twin all the way to a California King. One size fits all! This package contains two fitted sheet fasteners to be applied on the underside of one bed. Satisfaction guaranteed. We will reimburse and replace any unsatisfactory purchases. Lifetime guarantee!