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Behind The Design: Paradox SLS 2026
Interview with Finn & Jeffrey Spencer
The Paradox SLS was created with one clear goal: maximize take-off efficiency and freedom when riding with a parawing. We caught up with the designers Finn & Jeffrey Spencer yoto find out more about the design process of our newest freeflight-focused board. From the surf-inspired outline and step tail to the lightweight Biax Carbon construction, discover how every detail was developed to make connecting bumps and getting on foil easier than ever.
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The Paradox SLS is completely new in the Duotone Wing & Foiling range – what is it about?
Finn: The Paradox SLS is our new dedicated parawing board, but it also works incredibly well as a high-performance mid-length for winging. The whole idea behind the shape was to make getting up on foil as easy and efficient as possible, while still keeping the board surfy, responsive, and fun once you’re flying.
It was developed alongside the new Stash parawing. How closely are these two products designed to work together?
Jeffrey: Very closely. The Paradox SLS was specifically designed to maximize the efficiency of modern parawings like the Stash. Because the board is so light and compact, I can comfortably ride a 60 L board instead of the 45 L I’d normally choose for winging.
Finn: That extra volume makes getting onto foil much easier, which means I can ride a smaller parawing or foil while still being able to pump hard, carve aggressively, and keep the board feeling playful under my feet.
How important is the right board when it comes to early take-off and getting airborne efficiently?
Finn: The board is critical in parawinging because getting onto foil is naturally more demanding than in winging. You have less direct power, so every bit of efficiency matters.
Jeffrey: With the Paradox SLS, we focused heavily on pumpability and water displacement. The board is designed to accelerate efficiently through the water and release cleanly, helping riders get onto foil with less effort and less power in the wing.
What were you chasing with the shape compared to a more conventional wing board?
Finn: Compared to the Skybrid SLS, the Paradox SLS has a narrower bottom outline and a flatter rocker line. That creates more speed through the water and improves acceleration when pumping onto foil. We also reduced the overall bottom surface with features like the step tail, pulled-in outline, and enhanced rail bevels. This helps the board break free from the water more efficiently while still maintaining control and stability.
Jeffrey: The double concave in the nose helps the board push through the water smoothly during pumping, while the rounded forward rails are forgiving on touchdowns. Toward the back, the more angular rails increase stability during take-off and provide extra clearance when carving turns once airborne.
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»The Paradox SLS is the ultimate board for parawing downwinders, while also unlocking exciting possibilities for Prone Foiling, Foil Assist, and Freefly Wing Foiling sessions.«
The Paradox SLS leans heavily into pumping performance. How important is board design now for linking bumps and staying flying downwind?
Jeffrey: It’s hugely important. Once you’re on foil, you want the board to disappear beneath your feet and feel as surfy and efficient as possible. The flat rocker makes pumping between bumps incredibly efficient, especially during downwind runs where maintaining glide is everything. The recessed deck gives you a more direct connection to the foil, adding control and sensitivity through turns. At the same time, the compact surf-inspired outline and reduced swing weight make the board feel playful and maneuverable, encouraging riders to keep surfing and linking bumps nonstop down the coast.
If someone is already hooked on parawinging and looking for their next board, why should the Paradox SLS be their go-to choice?
Finn: The Paradox SLS makes getting onto foil noticeably easier while still delivering a really surfy and responsive ride once you’re flying. It pumps efficiently, carves beautifully, and feels incredibly connected in turns. Although it was developed specifically for parawinging, it’s also a great option for advanced wing foiling, foil assist sessions, and even prone foiling in the right conditions.
I’d also highly recommend pairing it with the new Crest foil. The Crest’s smooth rail-to-rail feeling matches perfectly with the Paradox SLS and creates an incredibly fun setup for parawing downwinders or up- & downwind laps.
With the Paradox SLS entering the Duotone foil board line-up, there’s now three midlength options in the Duotone range – the Skybrid, the Paradox and the Midfish. Can you explain the differences in a few words?
Jeffrey: The Skybrid is primarily designed for wing foiling, offering a balanced mix of stability, speed control and freeride performance. Its compact shape, wider bottom and higher rocker line provide great control at higher speeds, while footstrap inserts and jump capability make it ideal for dynamic freeride sessions.
The Paradox SLS is focused on maximum take-off efficiency, pumpability and playful turning characteristics. Designed with parawing downwinders in mind, it also appeals to advanced strapless wing foilers riding in freefly mode.
The Midfish, on the other hand, is optimized for foil assist riding, featuring a unique volume distribution with extra nose volume and a fish tail shape for clean cable routing, combined with a thin deck for direct control in turns and wave riding.
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