Onshore Wave Sailing. This is the ideal fin in on shore / light wind conditions and when sailing with strong side currents. We have updated one of our best sold fins used by wave sailors all over the world. Due to our new technology we were capable of modifying the outline and twist pattern in order to have a fin which functions even better. As the original designed X1 Wave was a pure onshore oriented wave fin with a powerful profile, the new X1 Wave EVO is matching its performance effortlessly, but also allows it to have better manoeuvrability on the wave due to the new twist distribution. Size: 21 to 25cm. Box System: U.S. Box / Tuttle / Power / Trim. Material: Moulded Pre-Preg