Got a chance to do a back yard trial run yesterday with my new UQ (new to me as I bought it from an HF member who never took it out of the box!). I was out for 2 hours to read and nap it was around 45*. The UQ was awesome and truthfully I got really hot! I believe the 20* rating for me will be high. I tend to sleep hot so this should be the only UQ I will need. Cannot recommend this any higher similar to my WBBB.