sn0wBound wrote an answer about Demon Snow Flex Force Top Body Armor - Men's on January 4, 2011
These do have fitted, foam plastic protection inserts down the back covering the spine. The provide ample protection to the area without limiting movement or bunching. Of course you wont have all the impact protections of the more rigid spine specific coverage but will be happy with your non-restrained movement and the adequate protection it does have! Get this product!
Add a snow flex force or snow shied for the additional hard cover protection when needed and you will be very happy with the results!