Cut four 6-inch strips of hook-and-loop tape from the roll.
Measure the depth of the bed frame and apply one side of each strip of Velcro to the inside edges of the corners of the bed, halfway down the side of the frame.
Lay the fitted sheets out on the bed, pull each corner taut to smooth the sheet and mark the location on each corner that corresponds with the Velcro on the bed frame.
Apply the other half of each strip across the outside corner seams of the fitted sheets along the marked section of the seam.
Sew the hook-and-loop strips to the bed sheet.