It has been opened, but it is unused. Freezes naturally below 21°C No condensation, no wetness, semi-permanently usable Keeps your neck cool for a long time PCM material developed by NASA This is a neck cool band. - Brand: CORRS - Color: Blue - Material: PCM material (NASA research and development) - How to use: Just hang it around your neck - Features: Cools naturally at 21°C or below, no condensation Thank you for viewing.