I got some cheap 1/2" thick foam floor pads at a local retailer of new junk probably for about $2-3 per 2' square. I think they are made for people who want a soft work area; such as to cover over concrete or tile temporarily.
They warm my floor up nicely. In the summer I like cool tile under my feet. This time of year, the floor pads are warm and soft. Let's just say 70f water temperature feels downright warm not cool or room temp.
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