The V-5 Flex (12.5) model is designed to be an all purpose fin for both bodyboarding and bodysurfing. Size Large (9-11). It has a five inch blade with the vertical side rails slanted down to a narrow tip.  This slim profiled VIPER is very lightweight and has excellent acceleration, maneuverability, tracking, and burst speed.  It uses shorter, quicker kicks.  VIPERs floaat hig and are visible in the roughest surf conditions.