Lift and short run in Atlanta. I've been seriously impressed with the North Face Omni jacket with the reflective heat shield. Light windbreaker without insulation but with their Omni Shield technology. Similar to what Columbia uses in their Gold 650 coat. Anyhow, it's been surprising that this light jacket has been sufficient for trail runs in nighttime as low as 20 degrees F for me. It's light enough that it can be used for runs in the 40-50s too. So I was looking up what heat the human body produces. At rest, 100 watts. Same as a very good light bulb. But during running as much as 15 times that. So an inner reflective jacket is incredibly efficient for a runner. If he has to spend the night though it's a different story.
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