This is the template and combination that I ended up with after living and surfing in Indonesia for 8 months riding predominately my 5'7'' twinfin back in 2011. With over 15 years of design and development, these joyous fins offer plenty of drive and hold with great pivot and control to keep you stoked and frothing. The small trailer fin removes the bad behaviour that you can sometimes experience with twinnys, without compromising the speed and freedom.  
 
Compatible with Futures Fins