FCS II Performer Performance Glass 2+1 Surfboard Fins - BlackBridging the gap between a twin and a thruster, this versatile set is adaptable across multiple board models and surf conditions. It's best to think of the Performer Twin as 2 3 Twin and 1 3 Thruster. The side fins are at the lower end of the S M size category and have a neutral sweep angle (Performer Family) and a streamlined outline from base to tip. The stabiliser, which has a higher sweep angle (Carver Family), is oversized compared to most