Hang Ten Soft Top SUP, Powder Blue, 9-Feet 6-Inch Ticked rails, marine grade plywood stringers molded into EPS core Single fin with adjustable fin box Core: EPS - expanded polystyrene Deck: IXL - cross-linked polyethylene with WBS - water barrier skin; Cotton: Co-extrusion - combo of surly and HDPE Stringers 4