Downhill mountain biking can be super fun, what with all the high speeds and adrenaline pumping drops, but it also can be dangerous. The POC Spine VPD 2. 0 increases your odds of getting back up after a gnarly crash for another run instead of being whisked off to the ER. POC's VPD armor has all the comfy qualities of soft and flexible armor with the strength of hard shell. It's soft and flexible to move with you as you ride, and hardens instantly in the event of an impact for consistent protection across multiple hits.