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Definition:
HH is a rating of how waterproof a fabric is. (Ranging between roughly 300mm - 10,000mm.) The rating refers to the pressure of water in millimeters i.e. a HH rating of 10,000mm means a column of water could be 10 meters tall before the fabric would start to show water seeping through.
Example:
1.6 oz HyperD PU4000 has a HH of 4,000 mm. You can find this info in the specs tab of the respective fabric.
Pronunciation:
/ˌhīdrə-stadik hed /
