05 May 2015
It hugs and reveals the curves and crevices of your body, accentuating a pubic mound here, delineating the round curve of a buttock there. The twists of light breathable cloth wick away moisture, and offer solid support without tightness.
Moisture, whether it's water or perspiration, causes the weave of the fabric to swell up just a bit (you'll notice this if you ever swim in a fundoshi), actually increasing the friction of the twists and knots and holding the loincloth in place even more securely.
As cool air passes over the dampened cotton or sarashi, it cools the contents of the fundoshi and takes advantage of the open weave to circulate around the equipment.
I wear fundoshi all year round, but I especially look forward to the sunny summer months when I can sneak in some sunning in my fundoshi, which leaves the best tan lines in the world.