I've used Buffalo Jackets and sleeping gear for years pertex has excellent wicking properties that make this kit really good!
1 it's light weight and windproof
2, if a single drop lands on it it instantly wicks over a large area(like bloting paper), because the area is larger it evaporates faster!
3, if fleece is worn under it you almost get a wet suit effect!
it's fantastic stuff just make sure you keep it away from the fire!