Negative ion effects can be affected by the material of the clothing.
This is because materials which generate positive static electricity such as nylon and vinyl neutralize negative ions.
Negative ions themselves and electrons they posses can pass through clothing and work on the human body.
According to some research, the permeation rate of negative ions is approx. 10% and it varies depending on the material they pass through.
We suggest you should check the material of your clothing in order to fully enjoy negative ion effects.