Twin hybrid.  Purchased for guest room, they unfurled quickly and were testable the next day.  Had a short nap on one and they're very nice... firm and solid feeling without being uncomfortable... the foam top being just enough.  Excellent!
  For the folks complaining about feeling the springs.... you have the mattress UPSIDE DOWN!  Photos of the many WayFair mattresses... show the grey bit at the top edge... ignore them... install the bed with the logo right side up... seems pretty simple... but people......