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AMK Heatsheets Bivvy Temperature Rating

Hi Dr. Can you tell me, in degrees F, how an AMK Heatsheets Bivvy would improve the temperature rating for an adventure sleeping bag. I have a sleeping bag which is rated functional to 40 degrees F.

A Heatsheets Bivvy – will add 10 – 15 degrees F. to the temp. rating of your sleeping bag. If you use it on the inside of your bag – plan on a damp night as the material does not breathe. If you put it on the outside of your bag, you will stay drier and warmer, but the outside of your bag will get damp from the condensation. this won’t be a problem if you are using a synthetic bag or a down bag with a water repellent coating on the nylon shell.

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