The Summer vibes Twin Keel 4.5" 2-Fin Set – FCii-Compatible is built for surfers chasing smooth speed, classic glide and that retro twin fin feeling. With a 4.5-inch keel template and premium fibreglass construction, these fins deliver powerful drive, long drawn-out lines and buttery rail-to-rail flow—perfect for fish shapes and cruisy summer conditions across Australia.

Each fin slots straight into the front tab of FCii-style fin boxes for a clean, compatible fit, and the rear tab locks in with a single screw, giving you total confidence. Quick install, secure hold, consistent performance.

They’re also an epic match for the Summer vibes Fish softboards (which have FCii compatible fin boxes) unlocking more speed, trim and fun in smaller waves while keeping your ride smooth and playful.

Why You’ll Love Them

• FCii-Compatible fitment – front tab clicks in, rear tab screws down.
• 4.5" twin keel outline for maximum speed, glide and retro-style flow.
• Premium fibreglass construction for stiffness, durability and predictable flex.
• Epic upgrade for Summer vibes Fish softboards.
• Ideal for small-to-medium Aussie waves where flow and speed matter most.
• Smooth rail-to-rail control with plenty of hold through extended carves.

Specs

• Size: 4.5" keel
• Set: Twin (2 fins)
• Compatibility: FCii-style fin systems
• Installation: Front tab slots in; rear tab fixed with single screw
• Construction: Fibreglass composite
• Best suited to: Fish boards, retro twins, keel-fin shapes

The Summer vibes Difference

Summer vibes hardware is designed for real Australian surf conditions—strong, reliable and made for fun. Whether you're trimming along a pointbreak, catching summer runners or carving lil' beachies, these keels give you the speed, hold and flow you’re chasing.