Race Cape is (as far as I can see) not breathable at all. However, I wore it at Ride100 last year and despite the fact that I was soaked through with sweat by the end, I was very warm, and it kept the rain off whilst I was waiting for the start.
I was hugely impressed with the breathability of mine the few times i've used it this year. Significantly better than the Gore one i've had previously (paclite)
Race Cape is (as far as I can see) not breathable at all. However, I wore it at Ride100 last year and despite the fact that I was soaked through with sweat by the end, I was very warm, and it kept the rain off whilst I was waiting for the start.