A:Answer Good day Janie,
Thank you for your interest in our FLTR product.
We always follow the CDC guidelines. As per their recent update, the secondary mask is to enusre a snug fit and that there is at least two or more amount of layers of covering. If you find the FLTR95 masks provides a snug fit alone then it is not necessary to wear an additional mask as the FLTR95 masks consists of 5 layers of polypropolene. If you are placing an additional mask on please be sure that it is breathable for you.