Freestyle fin developed with Andy ‘Bubble’ Chambers. K4 originally had two different prototypes; one worked great on flat water but would let go in the chop, the other was rock solid in the chop but too grippy on flatwater. The BUBBLE freestyle fin has the perfect blend of grip to be secure in the chop and into carving maneuvers, whilst still allowing plenty of release for double spins. A fin you can take anywhere which won’t let you down. Grip in the toughest conditions.