Hydrostatic Head
Waterproof Jacket Ratings Explained: 10k vs 20k Test (2026)

Most shoppers see a jacket labeled "10,000mm waterproof" and panic. They assume it's barely protection. Then they find a premium jacket at double the price rated "20,000mm" and think they've found the "real deal." The truth? Most of those higher ratings are marketing theater—and you're ...

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