Description: 【Advanced Cooling】: This Backpack Cooling Pad utilizes professional grade PCM, which absorbs heat through a physical phase change process. It maintains a comfortable temperature range of 25-28°C without the need for power, offering long term cooling that is more stable and enduring than traditional ice packs 【Versatile Outdoor Use】: Designed with an adjustable strap, this Body Cooling Pad can be securely attached to backpacks, vests, and other gear. It's ideal for hiking, camping, mountain climbing, running, music festivals, and other extended outdoor activities. It effectively prevents heatstroke and keeps your back cool and comfortable 【Ergonomic Design】: Designed to fit the curve of your back with lightweight materials that contour to your spine's shape. The adjustable straps of the Cooling Pack ensure both comfort and stability during movement without shifting around, making it suitable for people of various body types 【Breathable and Sweat Resistant】: The surface features breathable mesh cloth that wicks moisture away from the skin to prevent stickiness while the inner PCM layer blocks sweat penetration. This Ice Pack For Back keeps your back dry and avoids sweat stains on clothing or any sticky feeling on the skin 【Materials and Dimensions】: Made from TPU combined with PCM material for durability and effective cooling performance. The Summer Cooling Vest measures 12.60inchx9.45inch and comes with a backpack pad in the package list Specification: 32cmx24cm/12.60inchx9.45inch Package Includes: 1 Backpack Cooling Pad Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.