Waterproof Breathable Technology

Independently tested and verified

HydroBlock™ Warterproof-breathable technology

Our largest organ is the skin. While this amazing organ is well adapted to regulating our body’s temperature, things can get a bit tricky when layers of clothing are introduced. The reason for this is because our skin is constantly producing moisture to one degree or another depending on the conditions and the individual's metabolism. It would be simple enough to keep water from outside our gear from getting in, but what about allowing the skin to breath and to maintain relatively normal breathability? Our skin has the ability to create heat, exhaust heat, cool and be incredibly sensitive to all sorts of external influences.  We measure the performance of our fabrics in conjunction with a third-party testing facility called SGS Testing Laboratories. The good people at SGS go to great lengths to verify membrane and lamination performance all the while ensuring consistent performance throughout multiple use case scenarios.

But what do all these numbers mean and how does that affect you? Let’s take 10/10K for example. What does it mean? These numbers are a standardized testing method which indexes performance. The first number is measured in millimeters (mm) and is a measure of waterproofness. With a 10K or 10,000mm fabric, we put a square tube with inner dimensions of 1” by 1” over a piece of shell fabric, you would be able to fill it with water to a height of 10,000 mm or 32 feet before water begins to penetrate the fabric. Once two drops of water penetrate, then that is the index of measurement; the higher the mm of a fabric, the higher the waterproofness.

The second number relates to the breathability of a fabric. This performance index is taken by measuring how many grams (g) of water vapor pass through a square meter of fabric in a 24-hour period. The goal is to mimic a user’s body and is tested from the inside of the fabric to the outside. So a 30K fabric would allow 30,000 grams of water vapor to pass from the inside to outside in a 24-hour period.

The most important aspect of waterproof/breathable fabrics is keeping the body dry. Dramatic changes in temperature can lead to a hypothermic state.