The Science
Pelvic wellness is a microclimate problem.
Sustained scrotal heat is one of the most-replicated modulators of male reproductive physiology. The Wellness Boxer was engineered around a single goal: keep that microclimate measurably cooler, without compression and without polyester.
Loose boxers and sperm concentration
A 2018 Harvard School of Public Health analysis of 656 men recruited from a fertility clinic reported that men who wore loose boxers had ~25% higher sperm concentration than men who primarily wore tight, polyester-heavy underwear. The relationship persisted after adjustment for confounders.
Reference: Mínguez-Alarcón L. et al. “Type of underwear worn and markers of testicular function among men attending a fertility center.” Human Reproduction, 2018.
Polyester and the electrostatic case
Animal models have linked polyester underwear to localized electrostatic potentials at the scrotal surface and to functional changes vs. cotton-clad and naked controls. The mechanism is contested in humans, but the prudent design choice for a wellness product is to remove the variable: 0% polyester at any skin-contact surface.
Reference: Shafik A. “Effect of different types of textile fabric on spermatogenesis.” European Urology, 1993.
The 0.7°C cooling benefit
Internal Wellness Boxer thermography work compared a standard polyester boxer brief to our airflow-channelled cotton poplin under matched body-equivalent humidity and load conditions. We observed a repeatable surface-temperature delta of approximately 0.7°C in favour of the Wellness Boxer.
This is benchtop data, not a randomised clinical trial, and it is shared as engineering evidence of design intent — not as a medical claim about fertility outcomes.
What this product is, and is not
- Is: apparel engineered to lower scrotal surface temperature and remove synthetic-fibre contact.
- Is not: a medical device, a fertility treatment, or a substitute for clinician-led care.
See the full medical disclaimer for regulatory language.