The sheets felt really nice and were really easy to put on to the mat!
It was perfect for the mat.
I needed fitted bed sheets, I got fitted bed sheets!
The sheets are comfortable, but to me a "fitted" sheet stays snug to the mattress and is actually the same size as the mattress. The bottom sheet should fold around the corners snugly and create a bottom sheet without wrinkles. These sheets are extremely large causing wrinkles all over. Can be difficult to keep the slack underneath. Once you get it setup it's quite comfortable though.
We got these free as part of the deal for the tesmat mattress, which was nice. They're nice sheets, slightly paler grey than the picture on the website (which is fine with us). I'm used to cotton sheets only so probably wouldn't have bought them initially, but these weren't sweaty at all and had a really soft feel. The sheet fit the mattress very well, as you'd expect! For that reason, I'd probably recommend buying them if you're getting the mattress. If you're going to be using it a lot, consider a second set - I thought about it, but realised it was unlikely I'd need to have a set while these are being washed.
It would be nice to be able to select a second pillowcase, as my husband and I 'camp' together... we just used the sheets and left our pillows in the regular pillowcases instead.