Loose-fitting boxers made from breathable fabrics like cotton or modal offer the best support for men concerned about fertility. Research shows men wearing loose underwear have 25% higher sperm concentration and 17% higher total sperm count compared to those wearing tight briefs. For active lifestyles, engineered boxer briefs with a pouch design allow scrotal freedom […]

Scientific studies show boxer shorts correlate with 25% higher sperm concentration and 17% higher total sperm count compared to tight briefs, but by fostering cooler scrotal temperatures rather than fabric type alone. A 2025 review confirms tight underwear raises scrotal temperature by 0.5–0.8°C, which can impair spermatogenesis, yet fertility experts note switching underwear rarely resolves

Yes, underwear fabric can influence male fertility indirectly through its effect on scrotal temperature, moisture, and airflow. Studies show loose-fitting underwear (like boxers) correlates with 25% higher sperm concentration and 17% higher total sperm count compared to tighter styles. Synthetic fabrics like polyester trap more heat and moisture than natural fibers like cotton, potentially elevating

Boxers may be a slightly better choice than briefs for some men trying to conceive, but the science is not strong enough to make underwear the deciding factor. The biggest issue is heat: tighter underwear can raise scrotal temperature in some settings, yet studies are mixed on whether that meaningfully changes fertility. If conception is