Bought this over a month ago and have used it on several early morning runs in the dark. I can tell cars can see me much better than they could w/out this coat. On 30-40 degree mornings I've been wearing just a t-shirt under it and I'm plenty warm, but ventilation seems to be good which was a concern for me. I know one review brought up how little the coat breathed, but for me it is fine.Detachable hood is a definite plus. There are cuffs with thumb holes which I didn't think would be all that useful but when I forget my gloves they are nice.All reviews that say this runs small are right. I normally buy a medium but I bought the large based on other reviews and it fits perfectly.This jacket is awesome, the reflectivity is amazing and the jacket look cool! I wear this all the time when I run.I purchased this jacket as an all around poor weather running jacket. It has not let me down! If anything it is a little too warm. I've now worn the jacket in snow, rain and drizzle, as well as below freezing temperatures. The jacket also lights up very nicely with the reflective material!Purchased for all-weather training and was disappointed in the lack of water repellency. I did not notice any shedding in the first rain outing and was soaked within 30 minutes. It is well constructed and uses quality zippers and closures. The sizing runs a touch large but has waist and wrist elastics to adjust the closure.Excellent form fitting design. Zippers are easy to operate while running.My one complaint is that the media pocket is not insulated from sweat.I went through 3 other running/active jackets for rainy weather before this jacket. This is the best all-around by far. Very reflective, breaths well, keeps you dry in all but the heaviest of downpours. Well worth the purchase.Great night time running jacket... But makes me super sweaty, not very breathable.This is a very versatile jacket with nice protection from wind and water. Like it that the hood detached and also has vents. Runs a little small so order up from your normal size. LG to XL.