So, I picked up the DEWBU Heated Vest recently, and it's been a game-changer for staying warm in the cold.First off, the heating elements in this thing are no joke. They cover my chest and all of my back, and you can adjust the heat to three different levels. I leave it on high most of the time. The milwaukee jackets for $199 only have upper chest and upper back. The lower back is what really matters for back pain and this hits right.What I really like the power pack. Charges from USB C so thats convenient. Definitely want a 12v pack not a 5v one. The nice part is its thin, and the connector is small. The Milwaukee M12 battery and socket is huge, and round. It really isn't nice to sit in a char with the battery pack digging into your side. This has no complaints. It's there, but not a bother.Comfort-wise, it's great. It's lightweight and insulated. I planned on putting this between my sweatshirt and overcoat, but you gain efficiency having it as close to you as possible.Overall, if you're looking to stay warm and cozy this winter, this is a solid choice for the money.I wear a large T shirt and made the mistake of ordering a large, I was swimming in it. I returned it for a medium and it's still a bit big. You want this to fit tight, get a size smaller than a regular t shirt you'd wear.