FCS or Futures fins? What the fin cabinet says

Updated 2026-09-19

Futures, the single-tab box system, holds more fin sets in the cabinet than FCS, counting the FCS-compatible crossover sets on the FCS side of the ledger. That gap is not an accident. For twin fins specifically, Futures carries a far wider range of options.

Why Futures leads for twin fins

Twin fins run on two fins instead of three, so each box has to hold more of the board's control on its own. The single-tab Futures box was found to hold better under that load, and the range of twin fin models built for it is much larger than what FCS offers. Testing the full FCS twin fin lineup available, only five distinct options turned up: a Channel Islands FCS twin (smaller, for lighter or performance riders), a Mark Richards-style FCS II twin with trailer, the Power Twin (a larger performance twin for bigger riders or hard power turns), a Christenson FCS twin (more laid back, suited to a wider tail), and the FCS II Modern Keel, for a very wide swallow tail. Beyond a Mark Richards board, which was bought already fitted with FCS boxes, every other twin fin board in current rotation runs Futures.

What the cabinet holds by brand

Across the cabinet, the brand order runs Futures first, then NVS, FCS, True Ames, Captain Fins and Alkali, with Shapers, Soar and Mote behind them, and a scatter of smaller brands (Skip Frye, Bc Rudders, S Wings, Wild Things, Maui FC, Raido, and one-off makers) below that. Of the sets sold on, Futures accounts for the largest share, followed by Alkali and Captain Fin. The single item on the buy list is an NVS Trident.

Many of the third-party brands in the cabinet, such as True Ames, Captain Fins, Alkali, NVS, Soar and Mote, make fins to fit into either box system rather than being tied to one, which is why they sit alongside both Futures and FCS boards in the log without a box-system conflict.

What this means buying used

A used board's fin box system decides which fin set already in the cabinet, or which replacement fins, will actually fit. A single-tab Futures box takes only Futures-fit fins; an FCS board takes FCS-fit fins, and the two are not interchangeable without an adapter or a box change. When ordering a big-wave quad set built for a single-tab box, one fin needed a light sanding to seat properly on first fit, which is a normal part of breaking in a new fin rather than a sign of a bad fit. Checking which system a used board carries, and whether the boxes show any cracking or looseness around the plugs, is worth doing before assuming any fin in the cabinet will drop straight in.

Questions people ask

Is Futures or FCS better for a twin fin?

Futures has the wider range of twin fin options and was found to hold up better under the two-fin twin setup specifically. FCS still works, and one board in the log runs FCS twins simply because it came with that box system already fitted.

Can I use an FCS fin in a Futures box?

No. The two box systems are physically different and not interchangeable without an adapter plug or a box swap, which is outside the scope of a simple fin change.

Do third-party fin brands only fit one box system?

No. Brands like True Ames, Captain Fins, NVS, Soar and Alkali are made in versions to fit either box system, which is why they show up on boards running both Futures and FCS in the log.

How do I know which box system a used board has?

Look at the plug shape in the fin box: a single-tab Futures plug is a single slot, while FCS uses two or three smaller plug holes per fin depending on the generation. If in doubt, ask the seller or the original shaper.

For the fin categories that make most use of this choice, see twin fin fins and keels or upright twin fins. Buying-used checks generally are covered on the sell hub.