I bought these tights to extend my riding season to when it's 35F and raining out. I road tested them today on a 70 minute ride in the 40"s with steady rain. They performed well. I was pretty dry, and warm, the entire ride. I am 6' tall and weight 172 lbs and I bought the large size. They fit pretty well, although I would like the legs to be an inch longer. That is certainly not a deal breaker. I would not wear these tights above 50F, as they would be too warm, but for cold and/or wet conditions they seem pretty ideal.
Purchased these bibs specifically for cold damp days in the saddle. They are perfect for those cold day (35 degrees or less). Great wind barrier that keeps your legs warm, but not toasty. Excellent chamois, as expected from Castelli. Sizing is European, so you may have to size up from your normal kits. Comfortable fit.