Heatstroke occurs when the body can no longer regulate its temperature, especially during very high heat. The young and old, and many taking medications or who are otherwise not in good health, are particularly susceptible. However, anyone can suffer heat exhaustion and stroke. But, taking certain precautions can lower your risk.
The Mayo Clinic recommends wearing light and loose clothing if you'll be in the sun and heat. This allows air to circulate and work with the body's sweat to cool you down, keeps heat from being trapped and protects you from sunburn.