Delivery: tracked fast couriers. Local pickup possible.
The Summer vibes Twin Keel 4.5" 2-Fin Set – FCSii 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 FCSii-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 FCSii Compatible fin boxes) unlocking more speed, trim and fun in smaller waves while keeping your ride smooth and playful.
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.
Summer vibes is an independent, Aussie-owned and surfer-run brand committed to performance, quality and purpose-built products. Every product in our store is created to help make your time at the beach better, easier and more fun. Feel good supporting a small business in your community that makes it all possible.
Designed & developed on the Gold Coast, QLD.
Ships Australia-wide from the Gold Coast. See delivery rates by state.
Shop more: surfboards, softboards, leashes, fins, traction, board covers.
The right gear, a clear fit and a real person to help.
Match the fin base to your board’s fin boxes and the set to its intended setup: twin, thruster, quad, single or 2+1. Check the compatibility and rider-size information for this exact set; not every fin fits every system.
Unsure? Send us a photo of your fin boxes and your board model before buying.
Check the product title and inclusions for the number of fins and the intended setup: twin, thruster, quad, single or 2+1. Confirm any screws, key or adapters in the inclusions—do not assume every set includes them.
Summer vibes hardware has a 12-month guarantee against manufacturing defects from the date of purchase, for the original purchaser with proof of purchase. Normal wear, accidental damage and misuse are not manufacturing defects.
See the warranty and returns policy for your category’s terms and exclusions. If you need help, contact us with your order details and clear photos. This cover is in addition to your Australian Consumer Law rights.
Enter your delivery address at checkout to see available services, the final shipping cost and any eligible free-delivery offer before paying. Options depend on the item and destination.
Summer vibes is an independent, Australian-owned surf business run by Branchy. He designs and tests Summer vibes boards and hardware in Gold Coast surf conditions, and helps customers choose their gear personally. We also stock selected products from other brands.
We’re based at Snapper Rocks on the Gold Coast. Eligible order pickup is from our fulfilment warehouse at GC3PL, 14 Hawker Street, Currumbin Waters.
We don’t currently have a walk-in shop, although many stores nationwide stock our gear.
Choose pickup at checkout when offered, then wait for collection confirmation. Contact us to confirm warehouse hours before travelling.
Our boards and hardware are designed and tested on the Gold Coast. We partner with experienced, family-owned manufacturers—specialists in their respective fields, with more than 20 years of surfboard and accessory manufacturing expertise.
Already ordered? Visit order help and FAQs for tracking and confirmation-email questions.
Real people on the Gold Coast. Ask us anything about boards, sizing or your order.
