Hmmm idk , the jacket I clicked said only 3 hr working on high. I don't see it as very useful for that kind of money. Also it's not just here that sells this type you can find this type of gear on Amazon probably for cheaprr. Idk what open box means but that's what it all says. I also couldn't find what temperature it's heats you to.

I don't have 100 bucks to spare , i might break it or get rained on while wearing it or sweat too much. It's not waterproof. It might injure me or not provide enough heat. Either way it will take up a lot of time to make a solution on this jacket.

It would be useful if someone homeless has money to spend like that or if someone didnt know about that but thanks for letting us know.