The alternative to adding gadgets to your sheets is to try a sheet that actually works. You can try drawstring sheets. Elastic sheets are just not cutting it. Especially if you have a very thick mattress or have a feather bed topper. Memory foam mattresses also pose a challenge to elastic sheets. Tuck the bottom of the flat sheet under your mattress, and then move to the side. Grab the corner of the sheet that’s hanging out at the foot of the bed, and fold that corner up until it’s against the side of the mattress. Now tuck in the flat sheet, keeping the folded corner tightly in place to create a neat crease. Repeat on the other side. Leave it to Holdup Suspender Company's founder to build a better sheet corner garter strap, or fitted sheet strap, to cure the common problem of fitted bed sheets coming loose as you toss & turn in bed. Holdup's bedding sheet straps are called a Sheet Stay-Downs™ and is sold in two lengths and attachment styles. Shop for Bed Sheets in Bedding. Buy products such as 1800 Thread Count 4 Piece Deep Pocket Bedroom Bed Sheet Set Queen - Gray at Walmart and save.