K4 Fins

K4 Fins

We have to admit, at first glance Steve Thorp’s new K4 Fins didn’t immediately rock our world. Aimed squarely at the multi-fin market, they just looked like a budget alternative to a pair of G10 foils. OK – and potentially a much cheaper option for filling up a quad. Fair enough, we thought…

Look a little closer, and the plastic / fiberglass composite material isn’t just a price thing. Having spent decades chasing ever-stiffer fin materials for optimum performance, expensive G10 might actually turn out to be too stiff for a quad. Surfers only ever use them for straightlining big waves. But for grip through the bottom turn and snap off the top? Plastic composite every time.

k4 fin profile

But surely it must mean compromising performance for price? We all know plastic fins are way too soft to work properly, right? The stiffer the better – that’s why we pay top dollar for G10 nowadays. However, we’re talking multi-fins here, which are much shorter lengths – hence a softer fin will have less chance to bend. And actually, if multi-fin surfboard wisdom is to be believed, it turns out that a bit of flex could be our friend after all…

K4 fins profile shotAerialFreestyleThe board

So, the million-dollar question (or rather, the £44.95 per pair question…) do they actually work for windsurfers? Well, Andy King, James Cox, Oisin Van Gelderen and Rich Potter are already riding them and early indications seem very positive indeed. The fins apparently hold grip better through the top turn, with negligible difference in straight line performance. We have a pair of twins on their way to Boardseeker HQ, so stay tuned for a full test as soon as we’ve got to know them better…

More at:

K4 fins are available to buy now from retailers nationwide, including 4boards, LAR and


Newsletter Terms & Conditions

Please enter your email so we can keep you updated with news, features and the latest offers. If you are not interested you can unsubscribe at any time. We will never sell your data and you'll only get messages from us and our partners whose products and services we think you'll enjoy.

Read our full Privacy Policy as well as Terms & Conditions.