but it has less area

ARPANSA tested UPF 50+

Side pockets add function

and background information

lazy day in the sun

FCS II Modern Keel Twin Fin - White womens but it has less areaUpright keel template designed for traditional fish shapes. Lower sweep (rake) than most conventional, wider based keels which allows it to pivot in a really tight radius. High area and depth not only delivers a feeling of control when pushed harder on the open face, but helps to maintain tremendous speed through roundhouse cutbacks. Board Types Designed to fit the FCS II Fin System. Recommended for all board types including fish, funboard and twin