4.5" Extra Long Twin Keels – Natural Pro Glass | Futures Compatible (Set of Two)

Futures compatible. Depth 4.5” Base 6.75” Foil: flat inner face. Futures compatible tab size 3/4”

The 4.5" Extra Long Twin Keels in natural Pro Glass are a matched pair of large-base twin fins developed for traditional twin-fin surfboards and retro fish outlines that benefit from continuous projection and controlled rail engagement.
The extra-long keel base increases surface area along the rail line, supporting down-the-line speed, drawn-out turning arcs, and reliable hold through extended transitions.

Natural Pro Glass fiberglass construction delivers a balanced, predictable flex pattern suited to smooth carving rather than abrupt release.
The Futures-compatible base ensures secure installation in standard Futures side fin boxes while maintaining consistent alignment and stability.

Key Features

• 4.5" extra-long twin keel template with extended base for projection and glide

• Natural Pro Glass fiberglass construction with balanced flex response

• Designed for smooth carving and sustained rail engagement

• Increased hold and stability for retro fish and traditional twin-fin boards

• Futures-compatible base

• Supplied as a matched set of two fins

Ideal For

• Retro fish and classic twin-fin surfboards

• Small to medium clean surf conditions

• Surfers prioritizing trim speed, glide, and drawn-out turns

• Riders seeking stability and flow over tight pivot response

Why Choose This Product

The extra-long keel outline is intended to maximize continuous speed and predictable control along the rail line.
Pro Glass construction provides consistent structural flex, supporting smooth transitions and stable hold without sudden release.
This configuration suits surfers who value glide, projection, and classic twin-fin response in clean surf conditions.

Compatibility

• Designed for Futures side fin boxes

• Not compatible with FCS or FCS II systems

• No center fin required for standard twin-fin configurations

Frequently Asked Questions

What does “extra long” refer to in this twin keel design?
It describes the extended base length of the keel template, which increases surface area for improved speed, hold, and drawn-out turning behaviour.

Are these suitable for all twin-fin surfboards?
They are intended for boards designed for twin-fin use and fitted with Futures side fin boxes. Board dimensions and rocker will influence performance feel.

How do extra-long keels compare with standard twin keels?
Extra-long keels generally provide greater projection, stability, and hold, while shorter keels may feel looser and pivot more easily.

Summary

4.5-inch extra-long twin keel surfboard fins in natural Pro Glass, supplied as a Futures-compatible pair.
Extended base template delivers trim speed, stable hold, and smooth carving for retro fish and traditional twin-fin boards in small to medium clean surf.

We include

Free Delivery: Everywhere in Australia.

Tracking: Quick & easy online tracking on all fins. 

Peace of Mind: All our fins are insured against loss in transit.

Prompt Australian Dispatch: All items are sent from stock held in Sydney on the same or next business day.

Returns: 30-day, no questions asked returns, for unused full price items.

No More to Pay: No surcharges added at the checkout.

Express Shipping just $10 per order at the checkout.