Over the past year we have been able to thoroughly test the Rrd K4 new kite surfboard fin line with overwhelming results. The RRD Pro team riders have been impressed with the fins unique performance robustness. They found that the flex that K4 fins is renowned  for generated drive whilst still allowing full control in all conditions. As well as the performance  our team also found the fins were tougher in the real world, day to day abuse, being stronger to impacts and less prone to scratching.