Most mattresses are finished by either quilting, or tufting. Quilting produces a smooth, flatter finish while tufting features undulations on the mattress surface with pom-pom finishes.
Quilted
A quilted mattress offers sleepers a flatter finish with a high comfort level. Quilting is used to attach the outer fabric to the surface of the fillings inside the mattress.
Typically most foam and hybrid mattresses feature this type of sleep surface.