Science says your swimmers may be in hot water.

A review published in the National Library of Medicine examining the connection between testicular heat and fertility found that “elevated testicular temperature can trigger oxidative stress”—which may compromise sperm integrity during spermatogenesis, “potentially resulting in damaged spermatozoa and male infertility.”

But, for men looking to help keep things cooler down there, there’s one pretty simple fix: swapping out your underwear. Standard cotton tends to trap heat and moisture, whereas bamboo is naturally moisture-wicking, breathable and noticeably cooler to the touch.

On Amazon, a pair of popular pack of bamboo boxers retails for under $30 — and shoppers say they can feel the difference — even on hot days or during tough workouts.

The top-rated BAMBOO COOL Men’s Boxer Briefs feature 92% viscose made from bamboo and 8% spandex for some added stretch. The brand claims that they’re 30% more breathable than cotton underwear and keep overall body temperature bout 3 degrees cooler than cotton.

“I feel like bamboo is the perfect material for men’s underwear, for multiple reasons: It doesn’t insulate or trap your body heat like cotton. So you feel cooler, you won’t sweat and won’t ‘grow body odor’ by the end of the day,” one reviewer shared.

Beyond their natural cooling abilities, these briefs are designed with an elastic waistband for added comfort and a tagless design for a seamless, smooth feel all around. The four-pack is available in sizes XS through XXL and comes in a wide array of versatile neutral shades.

This article was written by Miska Salemann, New York Post Commerce Writer/Reporter. As a health-forward member of Gen Z, Miska seeks out experts to weigh in on the benefits, safety and designs of both trending and tried-and-true fitness equipment, workout clothing, dietary supplements and more. Taking matters into her own hands, Miska intrepidly tests wellness products, ranging from Bryan Johnson’s Blueprint Longevity Mix to the viral Oura Ring to Jennifer Aniston’s favorite workout platform – often with her adorable toddler by her side. Before joining The Post, Miska covered lifestyle and consumer topics for the U.S. Sun and The Cannon Beach Gazette.