I bought this jacket for running. I ran in 20 degree weather and stayed warm. I ran in rain and stayed dry. This is a nice jacket. The only thing that I don't care for is when I am done running and take the jacket off it is soaked with sweat on the inside. It is not breathable or well vented .This jacket is not breathable. It has a vent in the back, but nowhere else. In a warm rain on a humid day, I stayed dry from the rain, but not from my own perspiration! It's a good jacket, so I kept it, but I will probably only use it as a top layer in colder weather.Very good jacket. A little long in sleeves but does the job well.This jacket will be used for biking and running. Cars will automatically proceed with caution as the color makes one visible way ahead of time. I returned one like this because there was no hood!!!! This one has a hood and plenty of zippered pockets. It will be waterproof for sure but not certain on breathability , although there is a small mesh “vent” in the upper back inside.Wore this in the rain and shirt underneath was completely dry!Very lightweight, has lots of venting. The color is exactly what I needed so motorists could see me on my bike.I love this jacket. So light weight so you can literally take it anywhere. I love how it fits in the bag if you don't want to wear it. Definitely keeps me warm in any temperature. True to sizeThis was a nice enough jacket, I just thought it would have been a bit more to it. It was extremely thin, no lining at all. Was nice that it folded up and was packable though. Just didn't serve the purpose needed.