Thank you for viewing! ❤️ Price negotiations are welcome! ⭐️ First come, first served! ⭐️ Initial defect guarantee included! Persistent Cooling with the Latest PCM Cooling Technology: Reduces back sweat as a cooling pad for backpacks during summer outings, commutes, school, and shopping. The phase change material (PCM gel) adopted from NASA technology naturally freezes below 28°C, achieving continuous cooling when combined with a cool backpack. 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 adults and children. Designed for safety for both adults and children as a heatstroke prevention item. ❤️ I also have many other wonderful products for sale♡ ↓ Further discounts available for bulk purchases ↓ #yustore Management Number: 960-$$580