I would give less than one star for both the product and the seller if this was possible.
The product packaging looks good, but the product just doesn't work. I should have listened to the other reviewers. Really odd as I have used this type of product before. These handwarmers just don't get much above ambient temperature and last less than an hour. Bought them for skiing. Started with cold fingers. Stayed with cold fingers !
It says on the box that the product is used by the US ski team. I can't see why they would ! Either the products are faulty or they are misrepresenting the product.
I complained to the seller and wanted to return the box, but surprise, surprise, not response.
The low price is what tempted me, but don't be ! No point paying for something that doesn't work, regardless of the low price.