Got my AB Lifestyle "fitted" sheets today. The bottom sheet does appear to be fitted. I am washing them before I put them on the bed, so don't know yet how well it fits.
However, the top sheet appears to just be a regular queen size sheet. It is 78 inches WIDE for a bed that is only 48 inches wide. I laid it over my queen size bed in the house and it covers it completely. That means I will have 15 to 20 inches hanging awkwardly out of the exposed side of the bed. I know how bad it will fit because I am using regular queen size sheets on it now.
AB advertizes that the TOP sheet has elastic sewn in the bottom edge for a snug fit. There is NO elastic anywhere on the top sheet.
These sheets were more expensive than Airstream's fitted sheets. The material is nice, but it's the fit that I was more concerned about.