Persistent Cooling with the Latest PCM Cooling Technology: Reduces back sweat as a cooling pad for backpacks during summer outings, commutes, school, and shopping. NASA technology-adopted phase change material (PCM gel) naturally freezes below 28°C, achieving persistent 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 use by adults and children. Designed for safety as a heatstroke countermeasure for both adults and children. Versatile Installation for All Scenes: From preventing back sweat during commutes to heatstroke prevention for elementary school students, cooling during outdoor activities (fishing/fireworks displays), and multi-use for car seats/strollers. When attached to a backpack, it functions as a cooling pad; when removed, it quickly transforms into a cool cushion or cooling pillow. It shuts out the heat on your child's back during their commute, preventing heatstroke with natural cooling that eliminates the risk of frostbite. A multi-use design that balances cooling effects and heat countermeasures. Ergonomic × Lightweight Design: Optimized 22 x 28cm size for backpacks (compatible with all types of backpacks, from school bags to outdoor backpacks). 3D shape that fits the back for a cool, close fit. Ergonomic back fit shape + independent filling structure maintains a flat fit even after repeated use. Ultra-lightweight design of 6mm thickness and 190g (50% smaller than conventional products) for excellent storage. Back pad with ventilation holes promotes cool air circulation, preventing condensation and improving breathability. Adjustable clips for easy installation in 10 seconds, even for children. Safe and Durable with High-Quality Materials: Uses German-made biodegradable PCM (TÜV biodegradation certification). 3-layer barrier structure completely prevents frost and condensation. Clears the JIS S 4057 standard's 3x (30,000 times) pressure resistance test. Medical device-level flexible TPU material achieves natural freezing below 28°C (zero risk of frostbite). Uncolored ink technology with less than 0.1% color fading after 1000 washes + antibacterial treatment thoroughly suppresses mold/odor. Genki Techno Backpack Cooling Pad Cool Pad Backpack Cooling Sheet Summer Adults Elementary School Children (Khaki) 22cm x 28cm k23-1017 $$899