Thanks it did, still on the fence about spine protection. What good would it be on rails and jumps? I live in the midwest and thats all i really do.
Helps protect you spine (it's not going to make you invulnerable) if you slip on the heelside edge and slam your back into the rail by spreading out the impact... probably reducing the force your back by a factor of 10 at least (Pressure = Force / Area, if the area of impact is increase by a lot, the pressure on your spine is reduced a lot). Also the padding increases the time of impact... (Impulse = Force x Time, since the impulse is constant per impact, as your increase the time of impact, the force applied to your spine is reduced).
Physics... it's happening to you whether you understand it or not.
I like the Demon Flex Force Pro... or if you want to be Fancy the Demon Flex D3O Pro which hardens at the moment of impact.