My problem before ordering it was the unclear opinions regarding its size. Although most people said the jacket is wider than the considered "regular" fit, I couldn't understand exactly what that meant. I am 1.73m, 78kg, chest 61cm, I would say relatively fit (not much of a belly). I ordered the Medium, although there were (ambiguous) indications that the Small might have been a better choice.

Personal Conclusions: all the problems start from the inner lining. I would say they put a "Medium" lining (when wearing it you feel the jacket is tight and you think "good thing I didn't get the Small"), in an XLarge compared to other jackets. So, without the lining the jacket is big. As a result, the situation is "between a rock and a hard place," at least in my case. A bulky jacket in winter (due to the overall size of the jacket, but relatively "tight" inside because of the lining) and a large jacket in summer (without the lining). I should have tried it before ordering, but in Thessaly I don't know of any store that has it.

In general, they could have a more comfortable lining, so that it matches the actual size of the jacket. The jacket already has some form of insulation (the fabric is double, with a gap in between), from 8°C it can be worn comfortably without the lining. After 20°C, especially if you move around, forget it (always without the lining). It goes in the closet...

Suggestion: If you are 1.77-1.82m, 75-85kg and relatively fit (with a chest not over 61-62cm, otherwise the lining will be tight), get Medium. For a fit person 1.78m/75kg/60cm chest, it was Perfect.

Update 23/2: I have worn it 5-6 times with temperatures 5-15°C. It is warm, but nothing special especially considering how heavy it is. I consider my other jackets just as warm at such temperatures, but this one is twice as heavy, so in relatively warm weather (15°C) you feel "suffocated." Of course, there's no way I'm taking out the lining, since then I'd be "swimming" in it. If you have about my measurements, definitely TRY (probably BUY) the Small before purchasing. In terms of appearance, it's "catchy," personally I like it a lot.

Update 4/5: Since on one hand I liked its comfort, but on the other I thought it was too big for Spring/Autumn without the lining, I also bought the Small (€72!!!). Fit without the lining is perfect and the sleeves are much better. Lining is very tight, if I use it only a thin thermal fits underneath and the feeling is suffocating. If I get back to my "Winter" weight, it probably won't fit.

Update 24/3/25: Be careful with the buttons that close the jacket. They are sensitive, in no way do they match the image of the garment ("heavy use"). The last button (female) completely tore the - sensitive as it turned out - fabric and now I'm looking for a way to replace it with some other closing method, since there's no way to repair it as is. I'm afraid other buttons will follow, so be careful opening/closing them.

Update 24/01/26: 2 years later, if I had to buy an "M65 type" jacket now, I would look at HELIKON TEX or another brand. My biggest issue is the sensitive buttons and the huge and very long sleeves - I imagine due to the inner lining, which would be better if it didn't exist since it causes more problems than it solves. For example, with the Small size that fit me better, I had to pay a tailor to fix the sleeves, I bought an extra hunting Fleece jacket for the cold, while for the button that broke I still haven't done anything (probably won't do anything either, if it breaks further it's going in the trash)