This very cute cat-shaped hot water bottle is called the "Cat Warmer"!
(Reliable food-grade silicone / Microwave / Refrigerator-safe)
The "Mimamori Yutampo Cat Warmer" was featured in featured in the "Imadoki" corner of Fuji Television's morning information program "Mezamashi Television" (Aired on February 8, 2021).
It is microwave-safe, so fill it with water and pop it in the microwave, and you’ve got a warm hot water bottle that will be ready in no time!
It can also be used as an ice pack by filling it with ice water, making it a reliable “guardian water bottle” that will watch over you on cold or hot days.