The 2220 Model is an 8" mattress. It has a similar construction to the 2000 model but it is a more robust mattress due to the extra foam on the top layer and the base layer. It has a very popular comfort level because of the thicker topper foams. 
 
Layers​:
 Top: 2" memory foam (3lb dense)
Middle: 2" Convolute foam (2lb dense)
Bottom: 4" Support foam (2lb dense)