All three materials help in protecting a child in a side impact, yet their level of protection and way of working differ. Imagine falling from a great height. If you get to land on a trampoline that is perfectly adjusted to give you a gentle and controlled landing, this equals the Dynamic Force Absorber™.
If you land on a mattress, this equals soft foam. It also helps gently decelerating the fall but the deceleration is not as controlled as it can be on a adjusted trampoline.
If you land on a stack of cardboard boxes, this equals EPS. They deform a little bit, yet do not bend as much as the other materials do to break the fall and stay deformed after the impact. This way, cardboard boxes also have a shorter “distance of travel” during the deformation, which leads to a comparatively more abrupt halt.