A male health
engineering company.
KRYOS designs daily-wear apparel around peer-reviewed endocrine science. Our products are built from material chemistry up — not from fashion or fitness frames. Two physicians review every material claim before production. Manufactured in Porto, Portugal.
The problem we engineer around.
Three converging mechanisms quietly degrade male hormonal health, all through one daily habit: the underwear you put on each morning.
Heat. Synthetic close-fitting fabrics raise scrotal temperature above the threshold where spermatogenesis and Leydig cell testosterone output begin to fail.
Plasticisers. Polyester is built with phthalates. They leach through the inguinal skin — the most permeable on the body — and depress free testosterone with every doubling of exposure.
Compression. Athletic-cut briefs without anatomical relief compress the pampiniform plexus, 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.
Built in Porto.
KRYOS Model 001 is cut, sewn, and bonded in Porto, Portugal — one of three facilities in Europe with flatlock and bonded-waistband capability at our fibre composition.
Fibre origin: TENCEL™ Lyocell from Lenzing AG (Austria), bio-based elastane from Hyosung (Korea). Both materials are OEKO-TEX Standard 100 certified. The finished garment carries the same certification.
Every order ships with a numbered certificate of origin documenting yarn lot, knit run, and audit identifier. If you ever want to verify a specific claim, you can.
How we operate.
- 01 Evidence first. No claim appears on this site without a peer-reviewed study behind it.
- 02 No wellness language. We do not say 'energy,' 'vitality,' 'wellness,' or 'biohack.' We say what we mean.
- 03 No influencer marketing. Our credibility is built on doctors and data, not Instagram.
- 04 One product at a time. Each shipped before the next is announced.
- 05 Transparent pricing. One price. No discounts that train customers to wait for a sale.
- 06 Audit-friendly. Material certifications, manufacturing partners, and clinical reviewers are available on request.