I bought this for a cold weather commute. I was usually average but bought a large one based on reviews. it's a bit big. I don't know if a medium would suit me. I kept it as it allows for additional layers to be placed underneath. The jacket is heavy and very warm. I only use it when it's very cold outside. It should be under 40. I keep my armpits open and I'm still sweating. I don't think a waterproof/breathable material can handle moisture during intense physical activity. The reflectivity seems to be very good. One reviewer commented that he didn't like the loose mesh lining and I agree. Overall, I'm glad I bought the jacket. I give it four stars for this particular use.
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