Originally Posted by
Machka
Regarding sweat, sometimes it can be hard to tell how much you're sweating because good clothing choices and wind can wick it away. It's possible you could be sweating a bit more than you think you are.
Darker clothing can help. When you see salt deposits building up on your jersey or shorts, it's probably time for more salt and water.
Although I've occasionally managed a visible salt deposit on a yellow jersey. Hot day!