This product is the ReWarm Hot Ring, a reusable neck warmer. Size L: Fits neck circumferences of 350-390mm Color: Purple Surface Temperature: Approximately 50 degrees Celsius Heats up in 3 seconds. Reusable. Weight: Approximately 202g (with cover) Materials: Exterior: TPU Interior: Sodium acetate, etc. *Please check the product packaging for usage instructions. If you like it, please consider purchasing. I also have various other products for sale (*´꒳`*) #Namiko'sShop Although we can't see each other in this transaction, I will do my best to provide a pleasant experience. kokof206-20258-061-087-085