hope these pictures can do justice. it doesn't look as wide as it truly is when it is inflated. I tried to take pictures with light pressure to show how it actually spreads when you lay on it. it's quite stable and comfortable. I'll be able to say more about it when I get back from my overnighter with in on Monday.
*edit* sorry the pictures where down scaled and didn't turn out great he top picture shows show's that it's 27 1/2" edge to edge. the seams are 3/8 of an inch so the inflatable part of the pad is 26 3/4". when it's inflated with light pressure it's about 24 1/2" across. It's definitely spacious.