This is a neck ice pack from WE Trading Japan. The color is white, purchased in the spring of 2025 for 999 yen. I am selling it because I purchased several. It is new, unused, and unopened. It uses a special material called PCM, which freezes naturally below 28°C. If you're in a hurry, it freezes in about 30 minutes in ice water or about 20 minutes in the freezer. It lasts for 1 to 1.5 hours. Once it returns to liquid, please freeze it again. It's an item for heatstroke prevention that can be used year-round. It can be used repeatedly. The size is small, size S, with a neck circumference of approximately 29cm.