5,000mm and Below: Jackets in the 5,000mm and below range are designed for light rain and drizzles.
10,000mm: This range offers solid entry-level protection, ideal for work or outdoor activities in dry or mildly wet conditions. While they can handle moderate rain, extended exposure to heavy downpours may push their limits.
15,000mm and above: These are the cream of the crop, and offer top waterproofing and often breathability performance in wet conditions. The Betacraft ISO940 range falls under this category.