I have disabled all of them one after another, yet still my hair was clipping through the helmet. My suspicion laid with the skintight hazmat mod, the unlock all hairstyles mod or the valkyr face mod. So I have no idea if this is a vanilla problem or caused by mods. I hate clipping, as it really breaks my immersion, especially with something like the hazmat suit.
So just as I wanted to venture into the glowing sea and I put my hazmat suit on I noticed, that my hair is clipping through the helmet.