"Magnetically Fastener"
I hope their engineering and quality control are better than their grammar and proofreading.
I use a Halo on top too. I have a couple that are just bands, but also a couple that are full dew-rag style. If I'm going for more than an hour and a half in daylight I'll use the latter. Less than that, or at night, the headband style is fine.
You have to be moving in the same direction relative to the sun for awhile to get a perfect sunburn through the helmet's vents. At least with my helmet it's that way. More typical riding doesn't follow straight lines very long, so I'm less concerned about silk-screening a sunburn onto my scalp.
But it does happen sometimes on longer rides.