Single layer poly is the norm, and what Necky was using before being bought by Johnson Outdoors (which was done many years back).
the three layer plastic boats, like what is used by Valley and P&H, is stiffer, so has some very slight efficiency advantage. Not something which you or I would notice. But being stiffer, the three layer also does not take hard hits as well (likely the reason that P&H came out with a single layer surf spec Delphin).
Touring Kayak Paddles
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