Men's Cycling Shorts Without Elastane, PFAS, or Polyurethane

The Problem

The scrotum and perineum carry the thinnest skin on the male body. The scrotum is pharmacology's dermal-absorption reference site — where testosterone patches were designed to deliver hormone, at rates several times higher than the forearm. It's the skin regulators treat with maximum caution. The cycling industry treats it with none.

On a three-hour ride it's pressed into the saddle under continuous heat, sweat, friction, occlusion, stretch, and load. Every accelerator of dermal permeation is stacked against it at once. At sweat pH and body-contact temperature, polyurethane hydrolyses — releasing MDA and TDA, aromatic amines classed as suspected carcinogens. Short-chain PFAS molecules under 500 Daltons cross reconstructed skin at close to 60% in twenty-four hours.

The premium bib short is polyester-elastane fabric, a polyurethane-foam chamois pad, a short-chain fluorotelomer water-repellent on the outer face, and silicone grippers at the leg. Every premium brand ships some combination of the four. The pad crumbles to particulate against the perineum within five years. Twice a week, every week, for a decade.

The Gap

Wool shorts and chamois leather carried this sport through every Tour de France until 1974. The industry didn't retire them because they failed. It retired them because stretch panels simplified sizing, and a moulded plastic pad was cheaper to produce than a hand-stitched leather one. Seventy-five years of proven function, replaced on production economics. Every material we need is still in production.

What Should Exist

A cycling kit designed for the skin it sits on. Two shorts in one line — a padded bib for the long ride, a compression short for the training session, or under team kit — built from the materials the sport used for a century and then walked away from.

• Body fabric — 100% merino performance knit. No elastane. No polyester panels. No undeclared anti-felting coating.
• Pad (bib) — oak-bark-tanned chamois leather or boiled wool felt. Replaceable. No polyurethane. No TPU gel.
• Retention — plant-cured natural-rubber elastic covered in cotton, or rib-knit cuff. No silicone grippers. No TPU dot film.
• Finish — no fluorinated water-repellent. No antimicrobial chemistry. Published fluorine and composition testing, post-wash.

The Honest Position

This isn't engineered for the one-hour crit. The aerodynamic edge of a skin-tight synthetic compression panel — seconds across a three-hour stage — isn't in the spec. The chamois leather wants lanolin cream and an overnight dry between rides. The bib wants a cold wool cycle and a flat dry. The price sits at the top of the premium cycling tier, where hand-stitched leather and heavyweight merino have always sat.

The Investigation: The Second Skin — how the category sold as performance engineered the worst exposure geometry of any garment men own.