Futures Lost 6.25" Single Fin. The Evil Twin by ...Lost Surfboards is a free thinking, transformational toy for the post-modern retro surf world. A fully convertible mash up between Twin fin flamboyance and Single fin flair. Futures worked with ...Lost to develop the 6.25” performance “Sinister-Single” Fin specifically for their Evil Twin model. Use them in conjunction with any one of Futures’ Side-Bite options, to create the ultimate transformational fun machine… and expand your horizons beyond your wildest dreams. Note: see also …Lost twin 3.625” trailer for second set-up option.