Hydrus
Hydrus Replacement Fins (Set of 3)
These are the same 4.5" click-in fins that ship with the Axis and iSurf models, now sold separately. If you lost a fin or broke one, this is the replacement set.
They're made from semi-rigid TPU rather than standard plastic. That material flexes enough to absorb impact without snapping, so the mounting tabs hold up better in rocky river conditions. They're stiff enough to track well on waves and hold speed when you pump, but not so rigid they'll damage your board if you catch a rock.
- Set of 3 fins, $35
- 4.5" semi-flexible click-in fins, secured with two grub screws for a solid hold
- Semi-rigid TPU construction, more resistant to tab breakage than standard plastic fins
- Fits all Hydrus shortboard fin boxes, plus Hala, Sol, and many other inflatable river boards
- Compatible with the Axis river paddleboard and Hydrus iSurfboard
- These are the stock fins included with the Axis and iSurf models
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Product information
EVERYTHING YOU NEED TO HIT THE WATER
Every Hydrus board ships as a complete kit — no hidden costs, no extra purchases needed.
KNOW YOUR BOARD
Everything you need to know about this board — from performance to materials.
Purpose-Built for Performance
Every Hydrus board is designed and engineered in-house by paddlers who actually use them. Unlike mass-produced boards from overseas factories, each Hydrus is built in small batches with meticulous attention to construction quality.
Our proprietary layup uses premium woven drop-stitch material bonded with heat-welded seams — the same technology used in river rescue craft. The result is a board that's stiffer, lighter, and more durable than anything else in its class.
Who Is This Board For?
- All-around paddlers who want one board that does everything well
- Beginners who need forgiving stability without sacrificing performance
- Experienced paddlers who demand construction quality and stiffness
- Travelers who need a board that packs down and survives airline handling
Length: 10'6" / 320 cm
Width: 32" / 81 cm
Thickness: 6" / 15 cm
Weight: 19 lbs / 8.6 kg
Max Capacity: 275 lbs / 125 kg
Inflation Pressure: 15 PSI
Fin Setup: 2+1 (center + 2 side fins)
Deck Pad: Full-length diamond-groove EVA
Construction: Woven drop-stitch, heat-welded seams
Warranty: Lifetime
Military-Grade Materials
Woven Drop-Stitch Core: Unlike knitted drop-stitch (used in 90% of inflatables), our woven core has threads running in multiple directions. This means 20% more rigidity at the same weight.
Dual-Layer PVC Shell: Heat-welded (not glued) for a permanent, airtight bond that won't delaminate over years of UV exposure and use.
Full-Length EVA Deck Pad: Diamond-groove pattern for grip in wet conditions. Beveled edges for comfort during long paddles.
Reinforced Rails: Extra PVC layer around the entire perimeter absorbs impacts from rocks, docks, and other boards.
Stainless Steel D-Rings: 6 tie-down points for gear, plus a dedicated leash attachment point at the tail.
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WHY HYDRUS
WE EXIST BECAUSE YOU DESERVE BETTER
When we started Hydrus in 2012, the inflatable SUP market was flooded with identical boards from the same overseas factories — different logos, same mediocre quality.
We took a different approach. Small-batch production. Premium materials. Heat-welded construction. And a lifetime warranty because we actually trust what we build.
Every board is tested by our team before it ships. Every customer call is answered by someone who paddles. That's not a marketing line — it's how we've operated for over a decade.
FREQUENTLY ASKED QUESTIONS
What makes Hydrus boards different from other inflatables?
Three things: construction quality, materials, and accountability.
We use woven drop-stitch (not knitted like 90% of brands), heat-welded seams (not glued), and dual-layer PVC. This means your board is stiffer, lighter, and more durable.
But the real difference? We're a founder-led company with a lifetime warranty. We answer every call, personally test every board, and stand behind what we build. Most brands can't say that.
What does the lifetime warranty cover?
Our lifetime warranty covers manufacturing defects in materials and workmanship for as long as you own the board. This includes seam failures, delamination, valve issues, and air leaks caused by construction.
It does not cover damage from misuse, punctures, or normal wear. But even then — we have a repair program and will work with you to get your board back on the water.
How does the 30-day on-water trial work?
Take your board out and paddle it. Use it on flatwater, in the ocean, on a river — wherever you paddle. If you're not 100% satisfied within 30 days of delivery, contact us for a full refund.
We'll even send you a prepaid shipping label. No restocking fees. No hassle. We want you to love your board, and if it's not the right fit, we'll make it right.
Which board is right for me?
Paradise 10'6" — Best for beginners and all-around paddling. Maximum stability, easy to learn on, great for flatwater and light chop.
Joyride 11' — Best for intermediate paddlers. Slightly longer for better tracking and glide. Handles chop and wind better.
Venture 12'6" — Best for touring and fitness paddling. Displacement nose cuts through water. Fastest board in our lineup.
Still unsure? Email us at hello@hydrusboardtech.com — we'll personally help you choose.
How long does shipping take?
Orders ship within 1-2 business days. Standard shipping (free over $100) typically arrives in 3-7 business days depending on your location.
Expedited shipping is available at checkout. All orders include tracking so you can follow your board right to your door.
How long does it take to inflate?
With the included dual-action hand pump: 7-10 minutes to reach 15 PSI.
With an electric pump (sold separately): under 5 minutes hands-free. We recommend the Outdoor Master Shark II for the best results.
Deflation takes about 3 minutes, and the board rolls up to fit in the included travel backpack.