Jerseys made of wicking material will actually keep you cooler that riding with no shirt, and they'll protect you from the sun's harmful rays. Studies have shown that wearing a helmet does not raise core body temperature when riding. If at anytime during a race, especially a hot one, you start to feel dizzy or light-headed, or you get a headache or chills, stop and walk your bike. You may be going into heat exhaustion, or worse, heatstroke. Seek medical attention.
Bicycle racing is an inherently dangerous activity that can result in serious injury or death.
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