I'm guessing it's a Zpacks Duplex, it's basically the favorite tent of any through-hiker for the last couple years:
https://zpacks.com/products/duplex-tent They are very well designed and built--100% DCF so they're strong and light, yet great resistance to weather. Unlike most other UL shelters it makes almost no sacrifices and has all the niceties of heavier shelters, like a full floor and interior mesh, big vestibules, etc. And it packs up into an impossibly small size and weight in your pack.