I have 2 of these in storage. I really don't wear them day to day, as they were issued as uniform and I am no longer assigned to those specific details. I don't remember feeling cold. But that was a long time ago, and I was also wearing many layers of clothing. For my assignments, civilian, not military, it was okay. Very good that it protected from the elements. Not so good because it wasn't waterproof breathable, just water resistant. I was not in Alaska, or Antarctica, or Siberia....... NYC, Sierra Nevada Mountains, and assignments in the deserts of the Southwest...... Yes, the desert got cold at night. There was wind, temperatures dropped, flash floods do happen, and lightning storms. Although the only time I was ever in a desert flash flood, I was out drinking in Las Vegas Chinatown. Since we are suppose to shelter in place, I have time. Local temperature is 50°F, and windy. Not really fair, so I only wore jogging pants and a t-shirt. I step out, and yes, I felt the cold. That's my baseline. Now I can go for walks around the block to see how the jackets worked. 1st, I went out with an MA-1. It did the job. My torso was warm. Head and legs were cold. I should have worn a hat. Then I went out with the N-3B. Just as warm. Top of my legs were warm until the wind blew up the hemline and through the front opening. Open the zipper, stick my hand inside, and I could feel the heat inside the coat. The hood worked well. My head was warm. Now I wear the MA-1, with the N-3B over it. As Doctor Damage described. Raised my arms and swung them around. No restriction. Good range of motion. I wasn't just warm. I got hot. It felt like I was inside a room with the heater turned on. My personal observation is that I can wear, and have worn,an N-3B, and be comfortable. I also agree with Dr. Damage that modern uniform has more size range options, is better fitting, and the technology just doesn't compare. Even Alpha offers a slim fit, and other insulation options in the civilian market. Great that people still enjoy the way that they look. And for what it is, I think that it works, in the sense that I am warm wearing it. Although I wouldn't want anyone to think it's a great coat; because people on an online forum like them, or a Japanese ad makes it look great. It's still obsolete.