Thank you for viewing! ☆(=^ェ^=)☆ ❤️ Price negotiation → Highly welcome ⭐️ First come, first served ⭐️ Initial defect guarantee ❣️ [New, Unused] Opened for product inspection and photography. Continuous cooling with the latest PCM cold sensation technology: Reduces back sweat as a cooling pad for backpacks during summer outings, commutes, school, and shopping. Phase change material (PCM gel) adopted from NASA technology naturally freezes below 28°C, and combined with a cool backpack, it achieves continuous cooling. Keeps you cool for 60-90 minutes in an environment of 25-35°C (more energy-efficient than conventional cooling materials). Using the physical phase change principle like "ice that doesn't melt," it keeps your back cool and prevents body odor. Safe for use by adults and children. Designed with safety in mind as a heatstroke prevention item, suitable for both adults and children. ❤️ I have many other wonderful products for sale too ♡ ↓ Further discounts available for bulk purchases (=^×^=)↓ # Click here for a list of Muku's shop Management number: 5-280-$$1180