Improved Adjustable Sheet Grippers (Set of 4) $4.9
the ends are like the part on suspenders that clip onto the pants
- that part clips on the sheet at each corner.
The "ball" on the bottom slides up to tighten.
I have used mine for a cpl of months
& keeps the bottom sheet from slipping up and off the mattress.
wrinkle free across the whole bed?
Or do they just keep it from slipping off the corners?
It will keep the corners in place without damaging the linen,
however if it is a large bed it will will not prevent the middle
of the edges from slightly going in.
