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Hydrostatic Head: Definition | MYOG Glossary

Hydrostatic Head (i.e. HH)


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.



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. 



/ˌhīdrə-stadik hed /