These high quality, made in the USA, old fashioned 100% cotton, oversized bandanas are the real deal and can trace their lineage to old west cowboys, farmers and railroad engineers who relied upon them to wipe the sweat from their brow and keep the dust out of their face and collars. Keeping one (or more) handy in a pocket or tank bag will soon provide endless use opportunities. Wear one under your helmet to help absorb sweat and keep it cleaner, tie around the face or neck for sun/dust/wind protection, wear wetted for evaporative cooling effect, blow your nose into one, clean your hands off after a roadside repair or use as a placemat or napkin at a roadside picnic. But not all at the same time. Assorted colors with traditional paisley print design. 21.5"×21.5".
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Fundamentals of Evaporative Cooling
In hot environments and when exercising vigorously we all sweat cool ourselves evaporatively. It's very efficient, and if there's any kind of breeze available, as on a motorcycle, this works really well. Popsicles and wet neck wraps are great too, if you have those. The lower the humidity, the better a wetted t shirt or a moist wrap around one's neck works.
Evaporation from even a small wet bandana provides tremendous evaporative cooling to one's entire body. The circulation of blood passing by the evaporative wrap (carotid artery, etc) quickly carries the freshly chilled blood cells to every area of one's body. The 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 on one's wrist or eating ice cream too fast.
Re-wetting a bandana, neck wrap or silk scarf as needed while on the move is simple if you keep a squirt-type water bottle or water bag handy inside a tank bag or 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 this gear and your skin — just as nomadic peoples living in desert areas have done for centuries by wearing their traditional loose cotton and silk robes. (Those aren't 'colorful native costumes', but rather functionally highly refined clothing that works. Just like your riding gear.)
Mesh gear is fine for short-distances in these conditions, but during longer exposures the risks of inadvertent dehydration are significant. The tipping point between a healthy fluid balance and heat-stoke can occur quite suddenly, and the consequences may quickly become extremely serious. Even life-threatening in some instances.
Otherwise unexplainable single-vehicle motorcycle accidents sometimes happen on clear hot days because with no warning a rider may simply faint. One suddenly feels very sleepy and a moment later they go unconscious and ride into the ditch and crash at full highway speed, on an otherwise empty road. (Have you ever seen a photograph of a row of soldiers standing stiffly at attention on some 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 that could happen to you when riding. The danger is real.