... cotton fabric2) filling it with a combination of ice and cold water, it soothes tension headaches, bruises, swelling, migraines, hangovers and ... and NO toxin for our body.3) With Hot water, it can put beside our body and feet for ... sleeping. It can promote blood circulation.4) With Ice water, it can reduce temperature or fever and let us ... best.6) Temperature range: -20°C to 100°C Cooler Camping Bag