I have a waterproof breathable parka shell that I bought in the early '90s for skiing, it was still not enough, I needed the pit zips and upper back zip vents, glad it had them, plus good wicking layer and fleece, so never got soggy, would dry out fast in the lodge. WB is enough for me for low activity level, but not high, and biking is a lot higher activity level for me than downhill skiing.