During extreme summer days, place any glass or plastic bottle inside this cover with cold water and it maintains the temperature for 6-8 hours, vice versa in extreme winters it protects the water for 10-12 hours from being frozen even in -10 degree centigrade. So keeps it warm in winters. This is foldable and perfect for travelling especially if you want to protect water from Heat and UV while travelling in car, motorbike or any other mode. Easy to wash to keep it fresh.
