I'll be picking up Gore Bike Wear pants next week. They're water & windproof but they don't have a zip in the legs OP. I recently bought a Gore Bike Wear Jacket (my first ever cycling specific clothing) and am very impressed with it. It keeps me warm, even below freezing, dry in heavy rain and dries quickly. I'm hoping the pants will be the same.
Frank.
Sorry to quote myself, but wanted to give a little review of the GORE BIKE WEAR E GTX Active Pants I got in January.
For the OP, there is no zip and the lower leg area is quite narrow. I can slide them over my (normal) shoes especially using the plastic bag over the shoe trick. There are velcro fasteners to tighten the lower leg up afterwards.
These are certainly light, definitely windproof & waterproof.
These are less overtrousers and more specialised cycling trousers - in other words they are very comfortable to wear normally. They do not feel icky next to naked skin.
I've worn them down to 3 celcius with nothing under them and was not cold. Below that I've used merino leggings and not been cold. Minus 6 was the coldest (so far).
They're used mainly for commuting (1 hour), and I've also used them on a very windy and sometimes very wet weekend trip with no discomfort at all. They kept the wind off, repelled all the rain and were very handy setting up camp in the cold & damp.
I had a fall and slid along some tarmac and fully expected a rip in the material, but no damage at all.
What I don't know is how they will operate in warmer weather, but so far, I'm very happy with these.
Because I'm kinda stumpy the legs on mine are a bit long & baggy, but comfortable.
They are definitely not cheap but there is a gulf in the quality and comfort of these in comparison to some of the cheaper ones that I have used in the past.
I'd strongly recommend these, especially if you can pick them up at a reduced price.
Frank