Why is there Silicone gel on the top band? Just because these socks will slip. In fact, silicone is not able to fix these socks on the thighs. High-quality thigh high socks will not slide down, and there is no need to add silicone on the top band.
Silicone makes it difficult to put on these socks. Silicone glues the top bands together. It is difficult to separate them and fit them neatly on your thighs, they are also easy to contaminate dust, and they will collect the fluff of the socks.
Silicone easily loses its viscosity. When you wash these socks 1-2 times, the silicones will start to lose their stickiness, but it is difficult for you to remove them even if they lose stickiness. These silicones will become meaningless when they lose their viscosity, but even then you can't take them off.
In general, if you are worried about the sock slipping, the silicone in the top band will not solve this problem. A better solution is to try to buy longer thigh high socks.