What does "millimetres of water" mean in connection with dog wear?

"Millimetres of water" is a measurement used to determine the degree of waterproofing of fabrics. In order to determine the degree of waterproofing, a cylinder with a diameter of 10 cm is set onto the fabric and filled with water. In the following, it is measured at which filling height the fabric soaks through within 24 hours.

If for example, a fabric is listed as waterproof up to 2000 mm of water, this means that you can set a 2 metre long water-filled cylinder onto the fabric without the water getting through.

Detailed information about the waterproofing can be found on the respective product pages.