Fast, upright twin-fin drive with smooth fiberglass flex — classic Pro Glass twins designed for clean speed, tight arcs, and reliable everyday performance in FCS II-compatible boards.
The 5.7" Upright Twin Fins in natural Pro Glass are built for surfers seeking the classic speed and flow of a twin-fin setup with added control through an upright performance template.
Constructed from solid fiberglass Pro Glass, these fins deliver consistent flex, dependable drive, and long-term durability suited to regular surfing conditions. The upright outline promotes quick release, responsive direction changes, and smooth projection down the line, making them ideal for retro twins, modern fish shapes, and performance twin-fin hybrids.
Designed to fit FCS II-compatible fin box systems, this two-fin set provides a clean balance of traditional twin-fin freedom and controlled turning response, suitable for a wide range of wave types and board designs.
Key Features
5.7" upright twin-fin template for speed, pivot, and controlled release
Solid Pro Glass fiberglass construction for strength and consistent flex
Natural fiberglass finish with classic understated appearance
Fast down-the-line projection with responsive turning feel
FCS II-compatible base for secure modern installation
Set of two fins
Ideal For
Retro twin fins and modern fish surfboards
Performance twin-fin hybrids needing drive with manoeuvrability
Surfers seeking speed and flow over thruster stiffness
Small to overhead clean surf conditions
Riders wanting durable fiberglass performance rather than molded fins
Choose 5.7" Upright Twin Fins
These upright twins emphasise functional speed, clean release, and reliable control rather than excess rake or stiffness.
The balanced fiberglass flex pattern provides smooth acceleration through turns while maintaining stability at speed — key characteristics that define high-quality twin-fin performance.
For surfers refining a twin-fin setup, the 5.7" upright size offers a proven combination of drive, looseness, and everyday usability across varied conditions.
Compatibility
Fits FCS II fin box systems.
Not manufactured by or affiliated with FCS.
Frequently Asked Questions
Are these suitable for retro fish surfboards?
Yes. The upright twin template pairs well with traditional and modern fish designs, providing speed with controlled turning response.
What performance difference does Pro Glass provide?
Pro Glass is solid fiberglass laminate construction, offering consistent flex, durability, and stronger drive compared with molded composite fins.
Do these require screws in FCS II boxes?
They are FCS II compatible and typically install without screws, though screws may be used for added security if preferred.
Summary
The Eveley 5.7" Upright Twin Fins are solid fiberglass Pro Glass twin fins designed for retro fish, twin-fin hybrids, and speed-focused surfboards. They deliver fast projection, responsive turning, and durable everyday performance while fitting FCS II-compatible fin box systems. Ideal for surfers seeking classic twin-fin flow with dependable fiberglass control.
Fast, upright twin-fin drive with smooth fiberglass flex — classic Pro Glass twins designed for clean speed, tight arcs, and reliable everyday performance in FCS II-compatible boards.
The 5.7" Upright Twin Fins in natural Pro Glass are built for surfers seeking the classic speed and flow of a twin-fin setup with added control through an upright performance template.
Constructed from solid fiberglass Pro Glass, these fins deliver consistent flex, dependable drive, and long-term durability suited to regular surfing conditions. The upright outline promotes quick release, responsive direction changes, and smooth projection down the line, making them ideal for retro twins, modern fish shapes, and performance twin-fin hybrids.
Designed to fit FCS II-compatible fin box systems, this two-fin set provides a clean balance of traditional twin-fin freedom and controlled turning response, suitable for a wide range of wave types and board designs.
Key Features
5.7" upright twin-fin template for speed, pivot, and controlled release
Solid Pro Glass fiberglass construction for strength and consistent flex
Natural fiberglass finish with classic understated appearance
Fast down-the-line projection with responsive turning feel
FCS II-compatible base for secure modern installation
Set of two fins
Ideal For
Retro twin fins and modern fish surfboards
Performance twin-fin hybrids needing drive with manoeuvrability
Surfers seeking speed and flow over thruster stiffness
Small to overhead clean surf conditions
Riders wanting durable fiberglass performance rather than molded fins
Choose 5.7" Upright Twin Fins
These upright twins emphasise functional speed, clean release, and reliable control rather than excess rake or stiffness.
The balanced fiberglass flex pattern provides smooth acceleration through turns while maintaining stability at speed — key characteristics that define high-quality twin-fin performance.
For surfers refining a twin-fin setup, the 5.7" upright size offers a proven combination of drive, looseness, and everyday usability across varied conditions.
Compatibility
Fits FCS II fin box systems.
Not manufactured by or affiliated with FCS.
Frequently Asked Questions
Are these suitable for retro fish surfboards?
Yes. The upright twin template pairs well with traditional and modern fish designs, providing speed with controlled turning response.
What performance difference does Pro Glass provide?
Pro Glass is solid fiberglass laminate construction, offering consistent flex, durability, and stronger drive compared with molded composite fins.
Do these require screws in FCS II boxes?
They are FCS II compatible and typically install without screws, though screws may be used for added security if preferred.
Summary
The Eveley 5.7" Upright Twin Fins are solid fiberglass Pro Glass twin fins designed for retro fish, twin-fin hybrids, and speed-focused surfboards. They deliver fast projection, responsive turning, and durable everyday performance while fitting FCS II-compatible fin box systems. Ideal for surfers seeking classic twin-fin flow with dependable fiberglass control.
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