I imagine it’s more of a canopy than a sleeping tent. Something like an EZ up tent that provides more shade than just an umbrella.
I’ve used them and they’re pretty nice, especially if you’re going to be at the beach all day and don’t wanna get sun burned. That being said, it’s still a big purchase for just one day trip. I’d only invest in one if you were using it regularly, or had like a week-long trip planned.