I failed to see the logic in wearing more clothes to be cooler. But I also drink when I'm thirsty and eat when I'm hungry… so I'm kind of old-school.

Also might be worth noting that pros – the guys who have access to any equipment/clothing that provides an advantage – don't wear base layers when it's hot.

(Cue the internet search for that one pro who one time wore a base layer when it was over 70° - sun sleeves don't count. ;-)