1, advantages: the silica gel insole has good high temperature resistance and low temperature resistance, can be used normally at -50 degrees Celsius and 200 degrees Celsius, and will not freeze hard at low temperature and will not melt at high temperature; Environmental protection, non-toxic, without any peculiar smell.

2. Disadvantages: Insoles are airtight, and people who are prone to sweating can't use them, so as not to cause symptoms such as beriberi.