Worked has it shouldDo not buy. It is a SCAM. The item description implies that it has all that she would need to utilize the heating function, which would normally include a battery pack. Upon review, The item has a long description which includes poor grammar and repetitive words incorrectly translated, that imply it has a battery pack. However, all the way at the end, it says no battery pack included. The item is 41 dollars. This you are only get fleeced lined tights for 41 dollars. You can but fleece lined tights elsewhere on Amazon for $10. Further the only instructions that come with it are all in Chinese, there is no English translation on what type of battery pack to purchase to power the item. The average consumer dies not have the electrical system knowledge to buy the correct battery pack. If the wrong power source is plugged into the item, it overheats and burns your skin. Further regarding sizing it runs small. I am a size two, when I ski I like loose clothing for turns, this I ordered a size medium. It was to small. In addition, to return the item you have to pay for shipping. Do not buy this item.these would fit a 6 year old, maybe??? don't buy theseworks great after battery purchasedI like this because in cold weather sometimes waking up to charlie horses I wished I had something heated I could apply immediately so this will doTried all kinds of chargers, it warmed up in one section only; and when u unplugged it, it turned off. Waste of money!It didn’t come with a battery pack. The description and instructions make it sound like it’s supposed to come with one. Can’t use them without one.Pure garbageordered pants because they come with 7.5 battery pack, the pants came , no battery, if they are not going to send the battery pack they should advertise ,without battery.