Just echoing the prior comments, though it seems the mod author's moved on. The standalone masks should be wearable with helmets. I tried to delete the relevant slots in FO4Edit, which allowed me to equip the mask without removing my hat, but the mask itself still wouldn't show up. Not experienced enough with modding to know what's causing that issue, so I've uninstalled this mod for now.
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15 Energy Resistance
10 Radiation Resistance