1, stainless steel liner stainless steel material is more heat-resistant and lighter, and has strong corrosion resistance, so it is the first choice for high-quality thermos cups. But be sure to choose food-grade stainless steel liner, such as: 304 or 3 16.

2, ceramic insulation liner Ceramic insulation liner, this material liner is harmless, but it is relatively rare in the market and is rarely used by people.

Personally, I think the ceramic liner is good. Ceramic materials will not release harmful substances and are relatively safe and healthy.

The advantages of ceramic liner are excellent heat resistance, high temperature resistance, uniform heat transfer and strong adsorption, which can lock the moisture of food well and make dishes more delicious.