The Original 100% Cotton Bandana

We all sweat to cool ourselves evaporatively in hot environments, and when exercising vigorously. It's very efficient, and if there is any kind of breeze available, as on any moving motorcycle, this works really well. Popsicles help chill you from the inside out, and a wet neck wrap is good too, if you have one. The lower the humidity, the better a wetted t shirt or a moist wrap around one's neck works.

On a motorcycle the evaporation from even a small wet bandana provides tremendous evaporative cooling to one's entire body. The circulation of blood passing the evaporative wrap (via your carotid artery, etc) quickly carries the freshly chilled blood to every area of one's body. This effect can be so great one can actually become chilled despite it being a very hot day. It’s the same as putting an ice cube directly on one's wrist, or eating ice cream too fast.

Re-wetting a bandana, neck wrap or silk scarf while on the move is simple if you keep a squirt-type water bottle or water bag handy inside a tank bag or jacket pocket. And for longer days during very hot and dry conditions consider covering yourself entirely with something more protectively windproof than mesh. Any traditional leather or textile outer garment with a few zippered vents will let you manage and achieve a comfortable, healthy, moist microclimate between the gear and your skin, which is just as nomadic peoples living in desert areas have done for centuries by wearing their traditional long, loose robes. (Those aren't 'colorful native costumes', but rather highly refined functionally clothing that works. Just like your riding gear.)

Mesh gear is ok for short-distances in high-temp conditions, but during longer exposures the risk of inadvertent dehydration is significant. A tipping point between a healthy fluid balance and heat-stoke may be reached quite unexpectedly, and consequences can quickly become extremely serious…Even life-threatening in some instances.

For example, sometimes otherwise unexplainable single-vehicle motorcycle accidents happen on clear hot days because with little or no warning a rider may simply faint. When this happens one suddenly feels very sleepy and a moment later they go unconscious and crash at speed on an otherwise empty road. (Have you ever seen a photograph of a row of soldiers standing stiffly at attention on some military parade ground somewhere, on a very hot day, and one of them has suddenly fainted and is lying sprawled on the ground between the others?) If you don’t pay enough attention to your body's cooling needs and fluid requirements on hot days such a worst-case scenario may happen to you. This danger is real.