Aerobed 81021 12" Elevated Inflatable Air Bed Mattress with Edge Ring - Twin. The 12" Elevated Aerobed with Edge Ring is made of puncture-resistant, heavy gauge, PVC vinyl with electronically welded seams for dependable durability. Horizontal channel construction with edge ring for added support and comfort. So buy this and Save $30.04 Off on Aerobed 81021 12" Elevated Inflatable Air Bed Mattress with Edge Ring - Twin for $69.95 with free shipping at Rakuten.com.