Key Features 1. How to use - easy! 1) Freeze the ice packs - about 4 hours. 2) Put 2 ice packs into the pouch. 3) Place the pouch into the hard hat. 2. Set includes: 1 Pouch + 4 Ice packs(Ice pack design could be changed). 3. Advanced cooling 1) Super ice pack - Special gel included and lasts a lot longer. Ice packs are disposable goods and need to be replaced by time. How long? - Totally depends on your using condition! Based on the temperature, ice packs may need to be replaced every 2~4 hours. Make sure freezing the pack completely. 2) Patented ice pack pouch 3 separate space inside - based on where you put the ice pack, temperature changes. Silver-thread covered for anti condensation. Condensation - When you use this ice pad, as time goes by waterdrops will appear in the outside of the ice pack. It's INEVITABLE. In order to minimize condensation, this pad utilizes the pouch cover which is made with silver-thread. 4. Size Pouch - about 15.5 x 13.5cm (6 x 5.3") Ice pack - about 12 x 6.5cm (4.7 x 2.5") 5. About 120g when fully packed. NOT washable.
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