This is a pouch for carrying baby food, etc. It's a large size, approximately 28.5cm wide x 20cm high x 6.5cm deep. The inside is silver, but I don't think it has any cooling or warming effect. There's a small red stain? on the circle. I bought it on Rakuten. Please note that it will be lightly folded for shipping. I am also selling this on other sites, so it may be removed suddenly. Please comment before purchasing!