 So what it does, this acclimation process, is it helps riders produce more sweat sooner, and it also makes their hearts pump more efficiently, and their resting core temperatures drop, so they have more of a buffer when they're racing. Okay, so I get how they prepare for heat ahead of time, but what do they do when they're actually riding? Yeah, so before the race, you'll see riders warming up wearing these cute little ice vests. They're always in the shade with a fan blowing on them, and sometimes they shove nylon tights stuffed with ice down their jerseys. Oof.