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: 4.19'' / 106.3mmFin specs:Recommended Rider Weight: 55kg - 70kgFCS thruster finsSweep: 32Foil: FlatArea: 13.71'' / 8847mmDepth: 4.46'' / 113mm Size: one size.