The cookie settings on this website are set to 'allow all cookies' to give you the very best experience. Please click Accept Cookies to continue to use the site.

What does Hydrostatic Head (HH) mean?

Posted by Bethan Bithell on 5th Jul 2015

When buying outdoor clothing or equipment, you may come across the term ‘Hydrostatic Head’. This term refers to how waterproof the fabric is.

Hydrostatic Head Measurement

If an outdoor jacket has a Hydrostatic Head (HH) measurement of 5000mm, this means the fabric can hold 5000mm of water in a column before it starts to leak.

Therefore the higher the value, the more water and water pressure the fabric can hold before the water comes through.

As a rule of thumb, a basic waterproof outdoor jacket has a 3000mm HH value. At this value the fabric is classed as waterproof.

Therefore, if you are looking for a jacket that is highly waterproof and will withstand heavier downpours and extreme conditions, a higher value HH is needed, such as a Hydrostatic Head value of 5000mm.

An example of a shooting jacket that has a HH value of 5000mm is the Highlander Rexmoor Camouflage jacket.

  • 9th Apr 2019  B.Bithell

    Dog Walking Boots Buying Guide

    What to look for when buying a pair of dog walking boots Choosing the right pair of dog walking bo

    Read More
  • 26th Jun 2018  Bethan Bithell

    Hoggs of Fife Albany Tweed Collection - A Luxury Range!

    Hoggs of Fife Albany Tweed Collection Quality tweed jackets and accessories for ladies can

    Read More
  • 22nd Apr 2017  Bethan Bithell

    5 Reasons why you should wax your leather walking boots and shoes regularly!

    Spending a bit of time waxing your leather walking boots and shoes will save you money and time in t

    Read More