Men’s swim briefs Men's swimsuit made from nylon spandex Machine wash Made in USA California Muscle swimwear style S641 The new summer essential from California Muscle. This sleek California Muscle men's swimsuit features a deep black ground, accented with contrast white top stitching for a sporty look that's just waiting to get wet. With a drawstring waist and grommet details, the California Muscle Aegean men's swim briefs offer exceptional-quality construction and superior fit for hours of fun in the sun.