Majella underwear are grounded in scientific testing.
Majella underwear was developed in collaboration with scientists in the fields of textiles and electromagnetic radiation to most effectively support male fertility.
One pair, double protection
Majella underwear are the first to be designed from the ground up with optimal male reproductive health in mind.
Temperature effect
For normal sperm production, the temperature in the testicles must be lower than that in the body. Research has shown that optimal spermatogenesis occurs at a temperature that is approximately 2 to 6 °C lower than the body's core temperature (Mieusset et al., 1995, Zhu et al., 2022). Higher temperatures impair the function of spermatogenic cells and lead to reduced semen quality.
When testicular temperature increases, whether due to lifestyle factors such as prolonged sitting, a hot work environment, or tight underwear, or due to medical conditions such as varicocele, changes in semen characteristics often occur. These include reduced sperm concentration, poorer motility, and more abnormalities in their shape (Gao et al., 2022, De Toni et al., 2023).
At the cellular level, the mechanisms of these changes are well understood. Elevated temperature induces increased apoptosis of spermatogenic cells, oxidative stress, and sperm DNA damage , which disrupts the function of supporting Sertoli cells and inhibits the normal process of spermatogenesis (Durairajanayagam et al., 2021). As a result, male fertility is reduced, suggesting that testicular thermoregulation is crucial for maintaining reproductive health.
Radiation effect
In the case of non-ionizing radiation, such as exposure to radiofrequency electromagnetic radiation (RF-EMF) from wireless devices, research has shown a deterioration in semen quality: reduced concentration, poorer motility, and more irregular sperm shapes have been observed with exposure to such radiation (Kesari et al., 2018; Darvish et al., 2020).
Although the mechanisms are not yet fully understood, oxidative stress and sperm DNA damage appear to be key, indicating the need for caution in the long-term and close-range use of devices that emit RF-EMF.
Our research results
Cooling fabric
The microstructure of the fabric allows constant air circulation and maintains the optimal temperature of the testis.
The combination of silver and cooling fabric, consisting of extremely fine microfibers, enables up to 3.4 times greater air permeability compared to cotton material, facilitating more efficient ventilation and heat exchange. Tested at the Institute of Textile and Graphic Technology and Design, Faculty of Natural Sciences and Engineering, University of Ljubljana.
The cooling fabric is woven from pores formed with threads 5x thinner than a human hair, allowing for extremely efficient air circulation. Imaged under a microscope with a combination of 400× magnification.
3D designed pouch
It keeps the testicles separate from the body and allows for effective natural cooling.
In an internal study, we monitored the testicular temperature of volunteers during sedentary work for one month while alternating between wearing Majella briefs and standard cotton briefs. The results showed that Majella briefs significantly reduce heating in the testicular area and provide a permanently lower temperature throughout the workday.
In volunteers, we detected an average decrease in testicular temperature of -0.4 °C, and in individuals, the largest measured decrease was up to -1.3 °C.
Radiation blocking
The silver in the protective layer of the scrotum creates an effective electromagnetic barrier that does not let in radiation.
Majella underwear is designed to block radiation in the 2-6 GHz frequency range, a spectrum that also includes mobile and Wi-Fi networks. Testing at the Radiation and Optics Laboratory at the Faculty of Electrical Engineering, University of Ljubljana, confirmed up to 99.99% reduction in radiation transmission through the fabric.
