What 34,000 Test Kilometres Taught Us About Seams
Chafe is a design failure, not bad luck. Here is how we engineer it out of every garment before it ships.
Every garment we've ever shipped has covered at least a few hundred test kilometres on a real body before it goes to print — usually several thousand, across testers of very different shapes and gaits.
Chafe almost never comes from the fabric. It comes from a seam sitting exactly where two surfaces rub — underarm, inner thigh, the back of the neck under a pack strap.
Flatlock construction is non-negotiable anywhere fabric meets skin directly. It costs more to sew and more to pattern around, and it's the single biggest lever we have over a five-hour run feeling fine instead of feeling like a mistake.
We log every chafe report from testers with a body map, not just a comment. Two years in, the data has moved more seams than any single designer's opinion ever has.