Model 001
Model 001
CUT TO ORDER
Made in Porto · 6–8 weeks · Free US shipping
Your underwear is suppressing your testosterone. This is the fix.
Most men spend thousands optimizing their health — supplements, sleep, training, diet — then put on polyester underwear every morning and undo hours of work. Heat and plasticisers are two of the most documented suppressors of male hormone production. KRYOS Model 001 was engineered to eliminate both.
95% TENCEL™ Lyocell · 5% Bio-based Elastane · 0.00% Polyester
Two fibres. Each selected for a measurable property — moisture transport, thermal conductivity, plasticiser-free polymer chemistry. No filler. No synthetics. No phthalates, BPA, BPS, or PFAS pressed against your most hormone-sensitive tissue for sixteen hours a day. Audit trail available on request.
The evidence is unambiguous.
- +25% sperm concentration in men wearing natural-fibre underwear. Harvard School of Public Health, n=656.
- −7.72% testosterone per doubling of urinary phthalate exposure. Environmental Health Perspectives, NHANES dataset, n=2,208.
- −4°C scrotal temperature differential maintained by natural-fibre, anatomically relieved underwear. Journal of Andrology, replicated across multiple studies.
Polyester traps heat above the threshold where spermatogenesis fails. It leaches phthalates that suppress free testosterone. It compresses the venous network that cools blood entering the testes. Every brand you have worn was designed before any of this science existed. KRYOS was designed because of it.
What's inside Model 001:
- Full-front micro-perforated TENCEL™ cooling knit — maximum airflow across the entire anatomical zone
- 3D contour pouch — separation and support without compression
- Inner-thigh ventilation panel — eliminates the secondary heat and friction zone
- Flatlock bonded seams — zero raised stitching, zero chafe
- Jacquard woven waistband — KRYOS wordmark only, nothing else
- OEKO-TEX Standard 100 certified — every component independently tested and verified
- FSC-certified TENCEL™ — closed-loop sourcing from Lenzing AG, Austria
- 4-way stretch · moisture-wicking · naturally anti-microbial
Reviewed by an endocrinologist and a cardiovascular surgeon before production. Both retain advisory roles with no equity stake.
This is not a wellness product. This is not a fashion product. This is the apparel layer of a male health protocol — engineered around peer-reviewed endocrinology, built in small batches, refused everything in synthetic underwear that the literature has flagged as harmful.
Free US shipping. 60-day returns, worn or unworn. Customer service answered by a human within 24 hours.