Stress can't be removed in seats, so instead, we have to concentrate on the redistribution of stress. There are various theories used to attain the supply of stress; immersion/envelopment and offloading/redirecting. Immersion is the ability for the human body to sink to the material. It's described as the depth, that the body sinks to the support surface. Envelopment is understood to be the support surface's capacity to conform around the shapes of the human body.