Heat Reflecting Double Bubble Pad XLDescription This bubble pad is silvered on both sides and reflects 97% of your body's radiant heat back to you. Under most conditions this pad will keep you warm down to 40 degrees Fahrenheit ( 5 Celsius) if you are using a good quality 40 degree sleeping bag. Any other insulating materials like a fleece, spare clothing, hat, etc. can be placed under the pad for increased insulation. This pad is tapered, wider at the shoulders and narrower at the