This my first "real" running jacket. It's a great winter running jacket. I run in central Maine, it's cold here, I'm used to the cold so take my temperature recommendations with a grain of salt (or snow in this case). Overall great jacket but only giving four stars because that runs small and even if you order up the arms too narrow to roll up while running.PROS: This is a great jacket, it's warm enough to run in temperatures down into the 20's with nothing but a nylon t-shirt under it., and if you layer warmer stuff you could go much colder as long as you stay active. The front is warm and windproof and snow-proof but the back and underarm part is really breathable without being too cold. It does a remarkable job of allowing temperature regulation, which is great because my biggest problem with running in regular jackets are too warm, and you are overheating after 10 minutes or not windproof, or if they are they are not breathable and feel like running in a wet trash bag. I also really like the two big outside zippered pockets and the inner pocket. Additionally the main zipper works well even with light gloves on. It also have a nice feel to it while running, nice and flexible and not much in the way of weird nylon sounds that windbreakers sometimes make. This jacket doesn't flap around when unzipped either so that's also really nice. The red is very red, and very visible, I like not getting hit by cars so that's a win.CONS: My biggest complaint is that the sleeves are very narrow - I like to roll my sleeves up to cool off when running but these are too narrow, I can only get there up about 5 inches or so they are so tight. This thing is VERY form fitting, I'm a thin guy (5'10'' and 165lbs) and like form fitting but since I want to layer underneath it I needed to return it for the larger size. With the medium even a very light fleece caused the jacket to bind up under the arms when running. I had a medium, now I have a large, it's very nice. Not really a con for me as I did not buy this as a rain jacket but while the front and top of shoulders do seem nicely waterproof and beads water, the breathable panels on the back have zero waterproofing, the the water soaks right in so if you want a rain jacket, keep looking.Cálido y resistente para la montaña. Ajuste perfecto....kann ich nur weiterempfehlen.