This neck cooler is made of PCM material that fits snugly against the skin and cools to around 28°C or below. It feels like it fits the neck better than the common thin types. I think it's effective because it has a large contact area with the neck! - Size: L Used once. I no longer need it because I bought another one. It has been wiped and disinfected with alcohol wipes. Please refrain from purchasing if you are sensitive to used items. The outer bag has been discarded. The original price was 1780 yen. The actual product is shown in the 3rd and 4th photos. A cute mini towel will be included★