The ability of a material to compress in a very small area without affecting the area beside it. Viscous materials are not elastic however they respond to the area of compression exactly so for the sake of simplicity (although not exactly accurate terminology) we refer to all materials of this type as point elastic. Higher point elasticity translates into a better ability to form a pressure relieving cradle that forms itself to the exact profile of your body.
A term used on the site that stands for Posture and alignment, Pressure relief, and Personal preferences. These are the 3 main criteria that defines "your perfect mattress" and the goal of all mattress design and theory is to match these basic needs and preferences to the unique body type, sleeping style, and individual preferences of each person.
The ability of a material to form a cradle to the shape of a body which redistributes weight over the surface of the mattress and relieves pressure on the body prominences or pressure points of each sleeping position. Different designs, materials, and mattress layering and construction methods have differing abilities to relieve pressure depending on each persons body type and sleeping style.