Whitewater Paddle Board - KING DUB Whitewater SUP 9'8"x34.5" / 8'8"x34 – Hydrus Board Tech

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Whitewater Paddle Board - KING DUB Whitewater SUP 9'8"x34.5" / 8'8"x34"



"My King Dub is the best river board I've ever owned, and I have six other boards from different brands! The Dub is more stable, more responsive, and I can't believe it surfs this good. It's just more fun than any others. Durability - I've bashed it into plenty of rocks and abused it more than I probably should have, yet it's held up just fine! I've had one easy repair, but I've also repaired plenty of isups over the years. ...I love this board," -Jake K.

Much of river running is sensory, which becomes instinctual and automatic when you're on a board that works with you! 

"While inflatable boards have their conveniences, Armalight boards maximize performance!!" - Mark L. 

The high volume shed deck keeps water off and pops the board out of holes.  The recessed center fin allows you to slide over rocks.  The rail shape gives a combination of stability, forgiveness, surf-ability, and foot-steering.

"My King Dub will perform in ways an inflatable cannot! Secondary stability is out of this world and it out surfs any other board by a longshot!" - Devon M.

Shapers: Jason Zawadzki, Nick Zawadzki, Jeff Banks

Designed for performance, it's a blend of maximum stability, river play (Freestyle) and surf-ability. 

The bottom channel and contours aid in secondary stability, speed, surfing performance and extreme rock hitting your fin avoidance!  

SIZES: (9'8"x34.5" 285L / 8'8"x34" 250L) 

9'8": we have found this size to be the perfect length for a combination of speed, direction, and big-rapid domination while still being maneuverable, surf-able and great for overall river play.  The width at 34.5" is the maximum width we'd recommend if you want to be able to maintain proper paddling form and surf-ability.    

The 8'8" (50/50) is a true hybrid river running/surfing model.  Built for 50% surfing/river-play and 50% river running.  The same extra-deep channel as the 9'8" promotes stability, direction, speed and works as an extra fin. High-performing rails for sharper turning.

Contact us for sizing.   We love to talk with anyone ordering one of our more technical Armalight boards to ensure we get you set up with the proper size and shape.   


  • Vent/Handle System: 2020 Models come with a custom Hydrus Carbon Fiber Handle with Self-Regulating Gore-Tex Vent
  • Fin System: Recessed rock avoidance channel with 4.5" flexible river fin.
  • side fins optional
  • Traction: Custom made Hydrus Traction Pad
  • Construction: USA Hand Made in Eagle Idaho. Proprietary ArmalightComposite Construction with our Ultra-Lightweight Fusion-EPS Foam Core


9'8" / 8'8"

34.5" / 34"

*285L / 250L

*Extra Layer durability at: 35lbs / 31lbs

WEIGHT LIMIT/ 265lbs/20lbs *Depending on rider abilities and water conditions

Our Story and Pricing

Started in 2013, by two brothers a few close friends, and the dream to build small batches of premium boards with fresh ideas, responsible manufacturing, and a customer-friendly approach.  


We are a local co. just outside of Boise, Idaho, a city surrounded by beautiful lakes and rivers. Hydrus is quickly becoming known for personal service, extreme durability, new ideas, clean looks and our premium products.  


“Great boards, great service, good pricing and a company with a conscience!" -Tim M.  Owner of a JoyRide XL Inflatable.   


“Hydrus is the best! Amazing quality! I have 3 boards now and wouldn't even consider buying anything else! Hydrus rocks!!!” - Greg H.  -Owner of two Hydrus iSUP’s and an Armalight Board.
“River surfing is hard on equipment, and this board has hit rocks a ton of times. Its durability is unmatched...” -Derek D.  Owner of a Revo SUP and ToughBlade Paddle


In typical Hydrus fashion, we take a new approach to sales.  A Community Direct approach. We promote all that make our sport and community stronger. Referrals are the most authentic sales.   We spend very little on marketing but instead rely on word-of-mouth and the quality of our products.  Then, we give back to those who support us by way of the best service possible.

Over the last few years, we've invented Armalight Construction, CrossBoards, composite re-inforced iSUP’s, Tough Blade Paddles and boards with a Limited Lifetime Warranty.

From the beginning we’ve had a different mission for Hydrus.   We are all about supporting the sports we love and our community!  Our boards may be some of the most expensive to build in the world but we find ways to make sure our prices are more than reasonable.   Straight forward with no gimmicks, no overblown marketing budget, responsible manufacturing with almost zero waste, nearly everything done in-house and our main source of sales is referrals then we pass the savings on to you.   

We do a lot of R&D, design 100% of every product ourselves, and we maintain quality that’s far superior.

Thank you for the support!!!







30-Day Guarantee

Please try it out! 

If your buy one of our boards or other gear and it doesn't noticably make your life better in some way or if you aren't completely satisfied with the craftsmanship and performance, we will help you to ship it back and give you 100% of your money back - just a thanks for giving it a shot! 

So long as the item purchased doesn't show abnormal signs of wear and tear, and it's within 30-days of your purchase receipt and/or delievery reciept, we will offer you the choice of a 100% refund or 110% in-store credit towards a different product of your choice.

Buy and Try for 30 days, and Pay Later with Blispay, + 2% Cash Back on purchase. Learn More

Outside of the United States and certain territories of Canada, we are unable to cover return shipping due to prohibitive costs.  Hydrus will always work with customers in any region to ensure that the board they recieve is free of defect and shipping damage.  

*Custom boards and other products may not apply.  *See terms or contact us for full details.  



Armalight Care and Tips

All Armalight boards are lovingly hand-made by us right here in the USA. So, a slight variance in weight and appearance is natural. Paddleboard weights may vary +/-3lbs.  This variance will not affect performance.  Boards on the heavier side will be quite a bit more durable and may carry speed better in between paddle strokes.  

Nothing is indestructable. Armalight boards are just better.  We could make a board bulletproof but it would be far too heavy.  We aim for a balance of durability and weight depending on the boards' purpose and the rider's preference. 

A very slightly textured surface relieves surface tension caused by the viscosity of water, allowing an object to move through more freely.  Our matte finish emulates high-tech watercraft to have the fastest surface texture possible.  

Threats to any SUP include; standing on boards while on dry land, over-tightening hold-down straps and too much heat without a board cover. 

Repairs to Armalight can be easier that repairing fiberglass or plastic. Contact us, and we will be happy to guide you through. 

Like all high-quality foam core boards, you need to be aware of too much heat.  EPS foam has a softening point of around 190F Degrees.  This temperature can be reached if your board is left to "bake" in the sun uncovered.  Too much radiant heat from the top of a vehicle can be especially dangerous.  Be aware of reflected and radiant heat.

We highly recommend one of our Heat Shield Board Covers.  Insulated board bags are okay. We do not reommend board socks. 

Lifetime Warranty

The toughest, most functional boards on water - all back by our Limited Lifetime warranty on materials and construction.  

You are going to get the most from your money!!

From the get-go we wanted to build a business that has a positive impact on the world. That means, building the best products we can with no gimmicks or shortcuts and then treating customers how we would like to be treated.  


How many products do you own that you truly love?? ....Hydrus.

Hydrus unconditionally guarantees all products we sell to be free from defects of workmanship and material failures. We will gladly replace or refund any defective items you wish to return according to the terms of our Limited Lifetime Warranty.  

Inflatable Boards:  Hydrus Board Tech offers a Limited Lifetime Warranty on all it's inflatable boards.  All such products are covered against breakage due to defects in materials, and workmanship from the date of purchase.  Abuse or alteration of the product voids the warranty. 

In the event of breadake due to defects in materials or workmanship the liability of Hydrus shall be limited to the lesser of the cost of repairing or replacing the broken part. Failure to follow all recomended instructions may void this warranty. 

Original Owner: Warranty applies only to the original owner, and is not transferable. 


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