This is a product that, compared to the conventional products, stays warm for a longer time by using a “heat-retaining label” which utilizes insulating materials. Focusing on porous polypropylene having ne air holes with thermal insulating properties and low thermal conductivity, we have investigated and developed the application of drink bottle labels, and based on data for hand dimensions, we have come up with a bottle design that considers the ease of holding it and how it ts in the hand.