Abstract: In accordance with an embodiment of the present invention there is provided a sheet retainer for retaining sheet smooth and tight over mattress including, one or more adjustment straps circumference said mattress. The sheet retainer further includes one or more locking pins having an inserting cylindrical portion. The sheet retainer further includes one or more retainer bodies having a locking hole with upper, bottom, and middle hole portions. Flexible lock pin slits utilized for locking the locking pin into the retainer body. The sheet retainer body further having strap slide/lock slits for sliding the sheet retainer body along the adjustment straps and locking the sheet retainer body from moving along the adjustment strap after tightening said adjustment strap to the mattress.

Abstract: A device designed to ensure a smooth and tight fit of the sheet over the mattress, which includes a locking pin or convex cap and a base comprising a horizontal, bottom plate and a vertical plate with a locking hole or protrusion, respectively, whereby the sheet may be fit smoothly and tightly over the base and the locking pin inserted into the locking hole, or the convex locking cap fit over the protrusion, thus ensuring a smooth and tight fit of the sheet over the mattress.

Abstract: A device designed to ensure a smooth and tight fit of the sheet over the mattress, which includes a locking pin or convex cap and a base comprising a horizontal, bottom plate and a vertical plate with a locking hole or protrusion, respectively, whereby the sheet may be fit smoothly and tightly over the base and the locking pin inserted into the locking hole, or the convex locking cap fit over the protrusion, thus ensuring a smooth and tight fit of the sheet over the mattress.