Didriksons Technical Specifications Information
Dry Level - The Dry Level communicates the water column of the waterproof fabric and is only used in fully seam sealed Storm System garments. The Dry Level number is expressed in meters of water pressure the fabric can resist.
Heat Level - The Heat Level stands for the garments ability to protect you against low temperatures. A high level number has a better ability to isolate the heat and keep your body warm than a low level number. What effects the level is the garments insulation volume, if it's waterproof and/or windproof and how much of your body the garment covers.
Breathable Level - The Breathable Level is achieved using waterproof and breathable fabrics. If a garment is using waterproof and breathable fabric but seams are not sealed, this will result in a higher level number than if it would have has sealed seams as air will be able to pass through.
The other factor is the ability of a waterproof fabric to allow moisture vapour to be transported from the inside of the fabric to the outside. The level number indicates how many kilograms that will pass through 1m2 during 24 hours. The breathability can be measured in many different testing methods, Didriksons use the one called ASTM E-96 BW Standard.
It's important to look at the garments function level when you are looking for a garment to be used when you are active as ventilation's etc help you to keep a good micro-climate inside your protective shell.