Even with my breathable items I still sweat more. However, I am rarely soaked in sweat.
Add non breathable items and I am completely drenched. Several times it was bad enough you would have thought I had ridden through a rainstorm.

J&G breathable rain pants, or showerpass breathable rain pants w/vents?
they are priced the same. Showerpass seems better vented but which is better waterproofed?

This still doesn't tell me why making non-breathable rain gear is such a bad idea as you have stated... twice.
I just think they have their place, maybe not with you, but whatever... it's not worth arguing over.

Actually, the J&G do have vents. There are two vertical zips where the pockets would be. But there's no pocket lining: put your keys in your pocket and they're going straight to the ground. I've only tried them on in the house, not in the field, so I can't vouch for the quality of the venting. But I'd imagine a crisp breeze through there would certainly keep you alert.

the showerpass pants have vents at the knee which seems like a good idea.

So do the Nashbar ones.

When I started cycling in 2003, and at the time having no appropriate clothing for the sport, bought a pair of cycling shorts and a jersey from J&G through the internet. I had never heard of them, or any other manufacturer of cycling stuff, but figured I had to take a chance on someone somewhere. I have since bought a lot more cycling clothes, but find that in summer I invariably reach for those two original items. They have proved to be more durable and more carefully made than most , have endured many wearings and washings, and remain the best stuff I have ever bought. I realize that only two items is a small sample, but I'd recommend them.

I'm posting this gratuitous compliment because I am quick to complain about coming up short with shoddy merchandise , and figure I am obligated to pass along the rare compliment when it is due.

WOW I started this thread almost 2 years ago. Can't believe its still got legs