Normal springs wear down due to metal fatigue caused during compression. EVO-Boards use the next evolution in leaf springs to remain consistent and last longer.Similar construction as Stratum3/4 Vault BoardEVO-Boards have a larger sweet spot allowing for variations in entry positionSofter and less jarring feel allows for more repetition with anti-fatigue matting providing a unique softer feel on hands or feetWelded aluminum frame with handle for easy transportNo more changing springs or worrying which spring goes to which board with AAI3/4 EVO-Boards.