Ameristar's Ultra Shallow Series is available in 3 crash test certified configurations. The first is crash test cerified as M50/P1 (aka Gladiator) which is a K12/L3 equivalent rating. The second is crash test certified as PAS68 (aka the SP1000) and is equivalent to a M40/P2 or K8 rating. The final configuration is crash test certified to K4/L3 (aka the SMB) which is equivalent to a M30/P1 rating.