FCS II Christenson Twin + 1 Fin Set (L-XL) - BlackFCS II Christenson Twin + 1 Fin Set (L XL) The FCS II Christenson Twin Fin set delivers smooth, fast down the line speed, now available with a stabiliser fin and in a larger L XL size for bigger, heavier surfers. The Christenson Twin set is crafted to complement a range of twin fin designs, from high performance models to more traditional fish shapes. This twin set excels at generating effortless down the line speed while providing a fluid and