Keeps warm all night!
This thing is just brilliant. We have had it for a couple of years now. We have no central heating in the kitchen diner where our little girl sleeps, and she's a sphynx (yes, I know, we have no choice as my husband is allergic to her). Yes it's rock hard, but we lay a thermal heat reflective blanket under it in her igloo, then blankets so she is on a soft surface, and top with a snuggle bag inside the igloo, and the cat refuses to come out in the morning! Still warm at 10am I kid you not!