Breath ability as a rain poncho relative to everything else out there from coated to hi-tech whatever under moderate (40-70F) temperatures? I've wasted enough money trying to find the highly breathable rain wear. They all end up as street wear. Now that the Jacks have created a multiple use piece of gear at a reasonable price thinking poncho is the way to go. If this poncho breaths well because it's a poncho may take the scissors and thread to the WS2 and convert it into a poncho. But if this poncho breaths better due to the material it will be time for another JRB product.