Neck Cooler Cool Neck Kids Set of 4 For those who want to try various neck coolers. I think adults can also use them, but they were mainly used by children. ① Light blue check: Use by soaking the mesh part in water. ② Salmon pink dot: Use by soaking the whole thing in water and putting a cold pack in the pocket. ③ Light pink dot, ribbon tie: Contains highly absorbent polymer inside, which absorbs water and expands when soaked in water, utilizing evaporative cooling. ④ Red, Disney pattern, with fastener: Ribbon tie possible. Contains highly absorbent polymer inside, which absorbs water and expands when soaked in water, utilizing evaporative cooling. They have been used a few times, but please purchase if you understand they are recycled items. I checked the usage condition of ③ and ④ by soaking the polymer in water for the listing. They will be shipped dry, so the polymer inside will be uneven. There are no tears and they can be used without any problems. No pets, no smokers. Bundle discount available. Please ask any questions before purchasing.