Bought this during the fine spring weather of last couple of weeks so didn't get a chance to wear before it finally started raining on Monday. Coat is light weight (a plus) and looks well made. I bought it for quick (sub 1 hour) dog walks so I didn't need to wear my big barbour trenchcoat. However, it was as much use as a chocolate fire guard. I had a cotton tee shirt under the jacket so not like I was wearing too many layers (it was about 5c so certainly not warm). Within 10 mins I felt a trickle of something run down my lower back, so I opened up the jacket to find my teeshirt was absolutely soaked. It was sweat, not water. After 2 miles (40 mins) I got home and I was absolutely drenched in sweat. In future, I'll just go in my tee shirt as at least I'll get soaked in fresh water instead of sweat. So I guess the vented rear flaps don't do what they're supposed to. Sorry to say, I've just wasted £63.whatever as I won't be able to wear it in the rain.