I Am Looking for the Thin Corner Shaped Foam for Better Fitting Fitted Bed Sheet

Have you googled it?

IDK, maybe try Amazon.

I used to have some and didn't find them particularly effective. They kept slipping around themselves. It seems other customers felt the same way because, if I Google for fitted sheets, all I see are the "suspenders" (the straps that go underneath across the corner at an angle) or the cylindrical grippers that snap on the mattress edge. I checked Bed Bath & Beyond and didn't see anything.

You might stop at a local fabric store and tell the clerk what you are looking for. If you are somewhat handy and if you get some helpful advice, you might be able to create your own out of a thin foam.

What I think works best is the deeper pocket sheets that wrap all the way under the mattress corner. But of course the expense is a big turn-off.

Bed Bath & Beyond is pretty good at having sheets that are made for talk mattresses.

Just try the next larger size of sheets.

We have a beautiful antique bed and are the 3rd generation to use it. It's full bed size. We use a memory foam mattress and it's thicker than old 'double bed' mattresses used to be. Full sized sheets don't fit the bed anymore. They pull off the corners, We tried the foam corners and suspenders and the sheets still wouldn't stay on. We now use queen size, they are a teeny bit loose, but never pull off on the corners and there's plenty of top sheet for us both.

You just need to buy sheets that are the right size. If you're buying sheets that are too short...most mattresses are thicker now...then they're going to pop off on the corners. If you buy them too big/too deep then they're going to move around and be irritating.

First of all measure how deep your mattress is, how tall it is. Then measure it across and make sure the inches. I had a "queen" size mattress that was over an inch narrower than a regular queen was supposed to measure. I just bought the suspender things that go under the corners. They work like garters, one on each end of an elastic band. They keep things where they go. I buy ours at Walmart on the rack where the sheets are.

A mattress pad can always take up extra room if the sheets are too big too.

http://www.bedbathandbeyond.com/store/product/sheet-strap...

I googled mattress corner pads and found lots of options. Most are to protect little ones from the hard edges of the box springs or the frame. Don't know if that's what you mean in this case.