it's not going to do you much good in your jersey pockets. Ice in a sock wrapped around the back of your neck at the top of the jersey does actually give you some cooling for a bit. Bring a sock, fill it with ice at convenience store stops.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.