Like suspenders for your fitted sheets. T design is better than those with one strap designs. The 3 clips make it a bit difficult to install but once they are on, they stay on and keep the sheet taut.

Product is in fact cheap thin metal * and plastic union for elastic. Just stays loose. I set up and one of the clips broke apart on first use. Alligator clips are too small to provide a viable grip.

It's a perfect tool for getting your sheets tucked in without lifting the mattress. Works just fine.