Matt 'Mayhem' Biolos' 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. :: Unisex > Surf Accessories. Board Types: Performance shortboards and hybrid models with the FCS II Fin SystemIdeal Conditions: A wide range of conditions. particularly good in critical overhead wavesBase: 4.30'' / 109mmFoil: FlatFin specs:Recommended Rider Weight: 65kg - 80kgFCS thruster finsSweep: 31.7Area: 14.49'' / 9347mmDepth: 4.59'' / 116mm Size: one size.