The best solution for hot situation. The secret to long-lasting coolness is Vacuum insulated cool-keeping holder. By carrying an ice pack in this cooler holder, it blacks heat from the hot outside air and keeps the ice pack cool longer. This product utilizes the vacuum insulation structure technology that we have cultivated over 75 years as a vacuum bottle manufacture. In response to customer feedback, a pocket-sized version is now available! It fits in your pocket so you can easily carry the ice pack anywhere. A slim, easy-to-use standard size. Cool your neck, armpits, etc. to prevent heatstroke.