These things are super comfortable and warm for the most part. I bought them for my winter commutes so I don't have to wear too many layers on my legs and have found them to be a good balance between warmth and bulk. My only issue is they're shorter than expected but they still work when I have winter boots on that come up a few inches. With regular riding shoes my ankles get cold. For transparency I am long legged and have a 34.5 inch cycling inseam so I'm not surprised they're a bit short. Good stuff, would recommend.
These aren't like typical rain pants, nor are they like tights. They're a snug fitting multi-fabric pant that isn't totally waterproof. But they are the one of the best winter riding pants I've tried so far, the other one I rate highly is Sugoi firewall 220 which is more of a loose fitting tight, but these are made better. The SP pants are warm, even when wet. It takes a major rain for them to leak, mostly at the articulated knee, but without the special knee construction they wouldn't fit as nice. One issue for me is when I work up a sweat, the pants start to stick to my legs and then they inhibit my pedaling, but it's not nearly as bad as rain pants with the slick coating on the inside. I really hate typical rain pants for that reason. I'm 155 lbs, 5'-9 and the medium fits perfect, almost tight which keeps them from flapping in the wind. Perfect for commuting in the rainy season and comfortable below 40 deg. I won't wear these on a fast club ride for the reason I mentioned above, tights work better if you're riding hard and working up a sweat.
I'm between M and L and went with a L but the legs are a bit baggy for my liking. Otherwise, they are great pants for light rain and roll up fairly compact if you want to remove mid ride.
These pants are great for cold winter days, especially when it's nasty out there. I love that these pants go on top of my winter boots, so that rain or snow don't go in the boots. (This happens if I wear regular cycling tights.) The only complain is that they come down while riding, so you would want a suspender.
I've been using the Skyline pant in temperatures down to 6 deg F. At that temperature I'm using one light base layer plus a medium base layer. While you aren't ever going to be very comfortable at that temperature the Skyline still works pretty well. The pant has so far been a very good investment. I purchased a large, and with my 35 waist it fits very well even with the added base layers. At temperatures above 20 deg F, a medium base layer along with the pant works very well. I've yet to ride with these pants above 30 degrees, but I'm confident that they will meet my expectations. They are very comfortable to ride in and do an excellent job of wind breaking and keeping me comfortable in cold conditions. I'm sure that anyone riding during the winter in Pacific Northwest conditions would find this pant keeping them warm and comfortable on their rides.
have not used this pant in rainy conditions bought for winter riding (winter of 2013 which was a tough one) as my outer layer... does an excellent job of cutting down windchill these and winter tights are all that is needed into the single digits I like the Velcro at the bottom of the pant leg keeps the cuff in place