SIC's Vortex construction, which is a fiberglass-wrapped EVA core and wooden I-Beam stringer making it unlike other soft board today. This construction creates a fun, lively, high-performance feel. Its FCS Fusion compatible fin boxes are glassed-in a PVC reinforced to give you maximum lateral stability and drive through the turns. The foam-backed HDPE skin makes the Darkhorse durable and offers more protection when you get tossed in the shore break.