Don't listen to their boasting. This principle is simple. Anyone who has studied physical chemistry knows that it is easy to understand when you say it.

The cup has a jacket, and the jacket layer is filled with water. Although he may say he is a high-tech molecule, he is actually water.

The capacity of the cup is 300mL, and the water in the jacket layer is nearly 500mL.

Hot water 100℃, room temperature water 25℃. After shaking for a period of time, they exchange heat, and the temperature becomes (100 * 300+25 * 500)/(500+300) = 53.125℃, which is close to 55℃.

This is the principle of thermostatic cup. Don't be fooled by them. It's not worth so much money