Why is it necessary for the second (middle layer) to be waterproof?
I'm just asking because I'm going to be a first time rider this year and I already have a waterproof jacket, pants, and underwear. If my outer layer jacket is waterproof and it keeps snow out, what's the point of the middle layer being waterproof?
I was wondering because I already own a sweater thats 100% polyester, really warm, but it's not waterproof. On the other hand, I have another polyester jacket thats waterproof jacket, but its not as warm as the sweater.