CDC is now recommending more than 2 layers of fabric for better protection. Add a 3rd layer to each face mask.
If you want a 4th layer, be sure to add the filter pocket and a package of disposable filters to your order. This will add a 4th layer when needed in high risk or populated areas.
The 3rd layer will be a solid color, just like the layer against your face is always a solid color as well.