It's spelled wrong though... It' Kari Byron.this will cool ya off
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This has been discussed elsewhere (Back_marker actually made some good points on this, I believe), but it's actually a myth that you'll be cooler without your jacket. There's a long explanation for it, but you're actually going to keep your body temp lower with your jacket on than with exposed skin (also, exposed skin loses moisture faster, which leads to dehydration).