This was just in on another letter to this site. Sounds like
a marvelous idea for myself too. I forgot who did this, she's a smart lady.
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I noticed in my dog supply catalog they are now offering sleeping mats that have a "thermo reflective material" in them to provide a warm sleeping place for old, arthritic dogs. I have an old arthritic dog so I bought 2 yds of insulbrite to try making bed covers or quilts for his sleeping comfort. Since I am also old and arthritic I decided to test it on my own bed first. I put it under my bottom sheet for a sleep test. It feels sooo good I will have to go back to Joanns for another 2 yds for Lad!