Both myself and a friend of mine ordered these and had a similar experience. I'm a 5'7" male, 160 lbs, 40" chest. My boyfriend is 5'10" and about 180 pounds. We both use this jacket for road biking. I started with M and went for S, he started with XL and ended with MI. Comments I have a medium Size ordered. It was too big. The cuffs on my wrists were outside of my outstretched fingers. It could work as a top layer for a thicker jacket, but I usually only wear 2 thin layers underneath when cycling in 40 degree weather. If when it gets a little colder i don't drive I can only imagine how many returns they get of this product Seems at least a size larger than for everyday use where it might be a shell over a light down or fleece jacket , and two sizes up if you're looking for a jacket that doesn't blow in the wind Now that I'm the right size I'm very happy with the product, although I haven't had a chance to try his Long-term durability or to test under different conditions.
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