We are very pleased with these cushions.  Although we just received them, they are great on our patio.  We got the impression these were all one piece, but the backs are separate from the seat cushions, which is fine.  The foam cushion surrounded by fill is hard to find, so when we saw these, they were exactly what we were looking for.

A note:  These took almost two months to get to us.  This was during the Covid-19 time, so we knew it would take longer to ship.  Once they shipped, FedEx took their sweet time delivering.  PLEASE Wayfair, find a different shipper!!  Although my notifications from FedEx said all 6 boxes were out for delivery, they delivered the six boxes just one or two boxes a day over a period of a week.  Ridiculous!