Got the ExSyn9LW right out of the gate. I have used it from 80° temperatures at bedtime, right down to 20° wake up... Never slept too hot, or too cold. [Caveat: NOBODY sleeps that good when it's 80°... you gonna sweat!]
I think you should be fine with the 7. Mebbe go buy one of the $5 double-sided reflectix windshield shields. If it's going below freezing slide it in under the mat.
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