This is an ANNA SUI neck ring (size M, black) (neck cooler). ⭐︎ Condition: Brand new, unopened ⭐︎ Purchase date: June 2025 (Purchased at a department store) ⭐︎ Size: M (Neck circumference approximately 29cm - 34cm) ⭐︎ Color: Black Uses PCM material developed to protect astronauts. It can be used repeatedly in various situations.