Overview Matt 'Mayhem' Biolos's signature template delivers a lively combination of drive, hold and manoeuvrability. This versatile fin will feel reliable out on the open face or tight in the pocket. Tri/Quad (5 fin) set. Ideal Conditions A wide range of conditions, particularly good in critical overhead waves. Board Types Designed to fit the FCS II Fin System. Performance shortboards and hybrid models. Fin Family Reactor: Find Speed. Speed, tight turns & snaps.