it works well, it's well made, but make sure you realize it has a built in timer. If you camp in your van at night and have a spare battery that you use for things like this and expect you to keep you warm all night you'll wake up an hour later freezing. There is another blanket out there that doesn't have a timer for that purpose. But I keep this one in my boat for rides on chilly days when my mom gets cold. And here the timer is perfect so it doesn't accidentally get left on.