Futures EN Fiberglass Twin (Large) The EN Fiberglass Twin is a large sized twin-fin, offering that classic twin fin feel. It’s a versatile option for multiple board designs that throwback to the 70’s and early 80’s. The fiberglass material combined with a wide base and extra tall height gives this fin maximum drive, while the thinner tip allows for just the right amount of flex for maneuverability. Template Category | Neutral (balanced/fluid) Construction | Fiberglass Size | Large Twin Side Fins Area 22.75 Height 5.55 Base 5.44 Foil FLAT