Futures EN Fiberglass Twin FinsThe EN Fiberglass Twin is in our opinion the best large twin fins et for powerful Hawai'i waves and bigger dudes! A large sized twin fin, offering that classic twin fin feel. Its a versatile option for multiple board designs that throwback to the 70s and early 80s. 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.