How SoJ's will boost your fertility.
Backed by research, designed for you
Your health starts below the belt.
Multiple studies have shown that wearing loose-fitting underwear, like SoJ boxershorts, supports male reproductive health. A landmark 2018 study from the Harvard T.H. Chan School of Public Health found that men who regularly wore boxers had 25% higher sperm concentrations and 17% higher total sperm counts than those who wore tighter underwear.
A small change with a big impact
The reason behind this.
Temperature regulation. An earlier study published in the British Journal of Urology demonstrated that wearing boxers can lower deep scrotal temperature by up to 0.5°C compared to tighter styles. Since elevated temperature is known to impair sperm production, that seemingly small difference can have a big impact. At Son of John, our boxers are designed not only for timeless comfort — but for your long-term wellbeing.
Because you deserve the best
Dare to make the change.
Wearing loose boxer shorts is not just about comfort. It's about taking care of your body and gaining confidence with everything you do. At Son of John we have a mission: To bring the perfect boxershorts to the rest of the world and most importantly, to you.
