f6685979__Personal_Comfort_A5__Mattress__Personal_Comfort
Edge Support Provides additional edge support around the perimeter of the mattress. Allows you to be able to sit on the edge of the bed without falling off. [Sleep Number®] No Some models have air chambers that go the entire width and length of the mattress "edge to edge technology" which causes you to roll off the edge of the bed because of a lack of support. [Personal Comfort] 
Yes Edge support perimeter, available on all models. Value added feature.
Sleep Number p5 Bed ® versus the Personal Comfort A5® Mattress
Personal Comfort