FCS II Lost MB Performance Core Carbon 5-Fin Surfboard Fins - Large/RedThe FCS II MB PC Carbon Large Tri Quad Fin Set is Matt 'Mayhem' Biolos's signature template delivers a lively combination of drive, hold and maneuverability. Overview: Matt 'Mayhem' Biolos's signature template delivers a lively combination of drive, hold and maneuverability. This versatile fin will feel reliable out on the open face or tight in the pocket. Ideal Conditions: A wide range of conditions, particularly good in critical overhead waves.