Those DeWalt battery powered heating coats sound cool, but I'd be hesitant:
1) When the battery dies, the coat doesn't look very warm. It looks like a full charge last about 3.5 hours, which isn't very long for a football game.
2) Not machine washable
3) They cost like ~$150.
Carhartts are pretty warm, but layering is the key here. Instead of one really expensive coat, you can do better with a cheap fleece vest and a hard insulated shell.
If you wear thermal underwear, canvas pants, a fleece vest, and a Carhartt - you're not cold. Mark it down. Spend the money you save on a hat, gloves, and earmuffs. Smile the whole time.
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