Yes. TENCEL fibers are naturally derived, breathable, and moisture-wicking, which makes them well-suited for underwear. They feel softer than cotton and stay drier than most synthetics, particularly in warm conditions.
What TENCEL actually is
TENCEL is a brand name owned by Lenzing AG, covering two specific fiber types: Lyocell and MicroModal. Both are made from wood pulp, processed in closed-loop systems that recapture most of the solvent used. The result is a fiber that's soft, fine, and naturally moisture-managing, not because of a chemical finish, but because of how the fiber is structured at a microscopic level.
MicroModal is finer and silkier. Lyocell is slightly more structured and durable. Many underwear brands blend both, or blend one with a stretch fiber, to get softness plus recovery.
How TENCEL compares to cotton and synthetics
| Property | TENCEL (Modal/Lyocell) | Cotton | Synthetic (polyester/nylon) |
|---|---|---|---|
| Softness | Very high | Moderate | Variable |
| Moisture wicking | High | Absorbs, holds | Wicks, but traps odor |
| Breathability | High | Moderate | Low to moderate |
| Origin | Wood pulp | Plant | Petroleum-based |
Peer-reviewed comparisons of eco-friendly apparel fibers confirm that TENCEL-family materials perform well on sensory comfort and moisture management relative to conventional alternatives.[1]
Why it matters for underwear specifically
Cotton absorbs moisture and holds it, which means it stays damp against the skin. Synthetics wick fast but can trap heat and odor. TENCEL fibers move moisture away from the skin and release it, so the fabric stays drier and cooler to the touch.[2] For an area of the body that benefits from airflow and a drier microclimate, that's a meaningful difference in daily comfort.
- Softer against sensitive skin than most performance fabrics
- Naturally derived, not petroleum-based
- Stays cooler and drier than cotton in warm conditions
- Holds shape better than standard Modal when blended with a stretch fiber
Oakman launches Fall 2026. Founding members get first access and founding pricing locked in. Reserve your spot.
Where Oakman fits
Oakman is built specifically for active men looking for scrotal cooling all day and want the option of a cold pack for cooling in the sauna or after heat exposure. The fabric is TENCEL MicroModal, naturally derived from wood pulp rather than plastic, blended with ROICA V550, a clean Japanese stretch fiber, rather than conventional spandex. The fit is athletic with a gusset, an extra panel that gives the testicles room and airflow. Dyes are bluesign approved, so what touches your skin is controlled all the way through the supply chain.
If you wear underwear in and around heat, whether that's a sauna, a workout, or a warm commute, the fabric choice is the one variable you can actually control. Oakman is made to keep that area cooler and drier as a matter of design, not marketing.
Related reading
- How to Ventilate a Sauna and Keep Mold Out for Good
- Creative Ways to Design a Sauna Room That Looks as Good as It Feels
Related reading
- Best Breathable Underwear For Men
- Best Cooling Underwear For Men
- Best Fabric For Mens Underwear In Summer
Frequently asked questions
Is TENCEL better than cotton for underwear?
For most men, yes. TENCEL fibers wick moisture away from the skin and release it faster than cotton, which tends to absorb and hold dampness. The result is a cooler, drier feel, especially in warm conditions.
Does underwear fabric affect genital temperature?
Fabric and fit both influence how much heat and moisture build up in that area. Breathable, moisture-wicking materials help maintain a cooler, drier microclimate compared to fabrics that trap warmth or hold sweat against the skin.[2]
Can wearing tight underwear reduce male fertility?
Research suggests a link. One large study found men who primarily wore boxers had meaningfully higher sperm concentration than those in tighter styles, consistent with the established finding that elevated scrotal temperature is associated with lower sperm quality.[3] Fit and fabric both contribute to how much heat accumulates around the testicles.
Is TENCEL a synthetic fabric?
No. TENCEL is a brand name for fibers derived from wood pulp, making them naturally sourced rather than petroleum-based. They're processed differently from synthetics like polyester or nylon.
What is bio-based elastane?
It's a stretch fiber derived partly from plant-based sources rather than conventional petroleum-based spandex. It provides the same stretch and recovery but with a cleaner sourcing profile.
This article is for general educational purposes and is not medical advice. If you have specific concerns about fertility or your health, talk to a qualified clinician.
References
- Comparative Assessment of Sensory Comfort Properties Across Eco-Friendly Textile Materials for Apparel. 2025. Journal of Natural Fibers (Taylor & Francis). [Link]
- Comfort related woven fabric transmission properties made of cotton and nylon. 2021. Fashion and Textiles (Springer). [Link]
- Minguez-Alarcon L, et al.. (2018). Type of underwear worn and markers of testicular function among men attending a fertility center. Human Reproduction. [Link]
