How we test a jacket in a rain room
Four hours under 50 mm of rain an hour, a fan at force six and a mannequin that walks. This is how every KESTRUN shell earns its label.

Every shell we make spends four hours in a rain room in Porto before we sign it off. The room drops 50 mm of rain an hour, a fan pushes the equivalent of a force-six wind, and a mannequin swings its arms like it is walking to a train.
What we look for
We weigh the jacket before and after. A dry shell comes out within 20 grams of where it went in. We check the seams with a torch from the inside, then the pockets, then the hood peak, which is where most jackets fail first.
If a sample lets water in anywhere, the pattern goes back to the cutting table. The KS-04 took five rounds.
Our promise
Everything we make is tested in the rain room, and repaired free for five years.








