Purchased this in a size medium, in advance of doing a Jewish choral tour in Germany Dec 2019. It was amazing. It feels very light weight where you don’t think it could be sufficient, but it’s wonderful! I can’t stress how nice it was to not have to layer with extra vests-just one jacket, which took up no space. Use some jacket waterproofing spray on this end it really would be all purpose perfect! My only regret is I did not get it in purple instead. Another person on the tour who always runs cold purchased it and loves it.Make sure to read that you need to keep the battery periodically charged throughout the summer time.I had a little fluke with mine before the warranty ran out, where there was a tiny burn hole on the inside where the wires were and it melted a bit of the fabric. I contacted the company and returns were very quick and easy. Customer service was superb. They sent me a new jacket with new battery once I sent my jacket and battery to them.Regarding sizing, I am really small on top and I am surprised that the medium fits so well. This definitely runs small compared to most US sizing. I’m 5’5” and range 125-135 pounds and would not have wanted in hindsight to go smaller. I can’t tell you the last time I didn’t fit in a women’s size small top/jacket! It is reasonably tailored though I could deal with a little bit more in in the waist area since it looks fluffy-ish.