The reason for the recommendation of double masking is to add a filtering layer such as a surgical mask to a cloth mask, or, to improve the fit of a surgical mask by placing a cloth mask over it.
Because Vogmask has highly efficient filter media (N95 conforming), is tight-fitting to prevent gaps, comfortable and stays in position on face, you do not need to add a procedure (surgical) mask to supplement the filtering efficiency.
If you are wearing a Vogmask to a medical appointment or somewhere they do not know that Vogmask has a filter media inside, you may be asked to place a surgical mask over your Vogmask, which is perfectly fine and poses no safety risk. This extra layer will also keep your Vogmask outer surface clean in those environments.
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