Waterproof and Breathability Ratings

For an item to be classed as Waterproof or Breathable, it needs to meet a minimum requirement, but not all garments offer the same levels of protection.

Jacket waterproofness is measured in millimetres (mm). A 5,000mm rating means it can handle light rain. Ratings of 10,000-15,000mm can resist heavy rain and snow but may soak if under pressure. For extreme conditions and heavy load, look for ratings of 20,000mm or higher.

Breathability refers to how much water vapour can move through a square meter of the jacket's fabric in 24 hours. Ratings above 8,000g/m2/24 hours are good for general outdoor use. For active use, look for ratings over 20,000g/m2/24 hours. If you're planning high-intensity activities, a rating starting at 30,000g/m2/24 hours offers the best breathability.