Finn & Jeffrey Spencer

The Duotone Stash earned its name. Finn and Jeffrey Spencer, Duotone’s downwind experts, co-developed it with veteran designer Ken Winner, and the whole wing is built around one move: pack the canopy away mid-ride, foil free. That move is the reason parawinging exists.

The Stash, in Jeffrey’s words

Jeffrey Spencer sums up the product philosophy better than any spec sheet: “The best part about the Stash is packing it mid-session and just riding — no wing in your hands… When powered, it gets you on waves early and makes going upwind way easier than paddling.” One sentence, and it covers the entire case for a parawing in 2026: hands-free wave riding, early wave entry, and upwind ability a paddle can’t match.

Finn also fronts part of Duotone’s teaching output. The Duotone Academy YouTube channel features him, and it is one of the brand tutorial sources riders actually learn from. In the sport’s instructional media it sits alongside the Ensis and Flysurfer channels.

Duotone’s teaching line

The Spencers’ brand publishes some of the most direct beginner guidance in the sport, blunt enough by marketing standards to be worth repeating. Start on a bigger board with a bigger Glide-type foil. “Don’t expect Parawinging to be as easy as Wing Foiling — it’s not!” Beware dying wind, because a parawing can’t restart in a dropping breeze the way a paddle can. Stay out of breaking waves; lines tangle. And note that most riders fly leash-less, since a leash plus bridles is its own tangle risk. If the wing goes down, paddle to it before it sinks, because only the carbon bar floats. The weight chart for starters: 60–70 kg riders on roughly an 85–100 L board with a 900–1100 cm² foil; 80–90 kg on ~115 L with 1100–1350 cm². All of this we attribute to Duotone as a brand rather than to either brother personally. Individual authorship isn’t pinned down anywhere public.

What’s documented, what isn’t

Confirmed: the Duotone affiliation, the Stash co-development with Ken Winner, Jeffrey’s verbatim quote (one of the few in the sport verified against a named text source), and Finn’s presence in Duotone Academy tutorials. Not on the record: their home spots, ages, competition results in the SFT Downwind Parawing World Cup, or personal foil setups. In the community’s own mental map the brothers sit with the inventors and designers who build the gear the racers ride: Greg Drexler, Ken Winner, Dom Zimmermann, Aljaz Valic.