Based on the S-3, the XS-3 is a dedicated performance rig designed around the ergonomics of the smaller rider. Lower clew and boom cutout, as well as lower skin tension to suit lighter weight sailors.
This is a real flexing sail, built on scaled down technology allowing even the smallest sailors to push their limits. It is sold as a package for simplicity and compatibility. Or as separate components, all designed around smaller rider ergonomics.