T2 Fiberglass Twin FinFutures T2 Fiberglass Twin Fin The T2 twin fin features an upright design, allowing for tight turns in the pocket. Built in solid fiberglass construction, the base of the fin remains stiff for maximum drive, while the tip is thinned out, allowing the fin to flex and provide the rider with a responsive feel. Template Category Pivot (tight turns loose) Construction Fiberglass Side Fins Area 19. 48 Height 5. 41 Base 4. 90 Foil FLAT