Thank you for viewing! ٩(^o^)۶ ❤️ Price negotiation welcome! ⭐️ First come, first served! ⭐️ Initial defect guarantee! From winter's "hidden stuffiness" to summer's "heatstroke"! This is a next-generation PCM material cooling pad for backpacks that freezes automatically below 28°C. 【Key Points!】 Solves "hot back!" in winter: Don't you sweat on your back when wearing a backpack in heated trains and buses, or with a thick coat? It absorbs heat naturally without getting too cold at 28°C, making it ideal for preventing "flushing and stuffiness" in winter. Freezes naturally below 28°C: It freezes automatically just by placing it in an environment below 28°C, without putting it in the refrigerator. It also doesn't condense, so you don't have to worry about your important bags, documents, or textbooks getting wet. NASA technology PCM material: A mysterious material like ice that doesn't melt. The "natural coolness" that isn't too cold lasts for 60-90 minutes, and there is zero risk of frostbite for children. Ultra-lightweight 190g & easy installation: With a slim design of only 6mm, it doesn't interfere with carrying comfort. It's clip-on, and can be attached and detached in 10 seconds from backpacks to business bags and strollers. Size: 22cm x 28cm (equivalent to A4 size) Material: German-made biodegradable PCM, high-durability TPU Condition: New, unused ❤️ We have many other wonderful products for sale ❤️ ↓ Further discounts available for bulk purchases (=^x^=) ↓ #Panapana'sShop Management number: mryj 22/1577pp