In this cold weather in Japan, I cannot live without Hokkairo, portable body warmer . And I also took it with me even when studying abroad in Boston. I wonder why this product is not popular in overseas. As many of you know, is first produced in Japan, however, this idea came from “foot warmer” American soldiers were using. This is small and portable warmer, and its inside is iron powder, salt, activated carbon and water. When these are blended, it will make warm. Its warmers last usually about 18 to 20 hours. Surprisingly, the warmers can be recycled. After you finished using, it has effect to deodorize while putting into your shoes. This is a small trivia, so please try it!