The dew point is the combination of temperature, humidity and pressure when condensation occurs. In a clothing system this typically occurs first in the outer layer where moisture laden air from the body meets cold, damp fabrics. However, condensation in these outer layers can cause them to saturate (they can appear to change from hydrophobic to hydrophilic - a sentiment change) causing a loss of insulation and allowing the dew point to creep closer to the body. This is why you often find wetness inside perfectly waterproof garments. In civil engineering it is sometimes called cold bridging.
FurTech jackets are designed to resist Dew Point Creep. The furry lining fabric (the synthetic fur faces away from the body) directs liquid water outwards and is designed to stay warm when wet and dry quickly. However, there are, inevitably, times when these systems can be overcome. It is then time to add an OverShell or warm up in a Shelter.