Flying and radical on a foil, but also on a fin! Designed for foiling up to 18knots from zero. Designed for fin from 13 knots to 21 knots. The only big sail needed if you foil for fun. Early planning and easy handling. 7 battens and 3 cams on the 8.4 7 battens and 2 cam below the boom on the 7.4. 5 battens and 1 cam below the boom on the 5.4 and .64.Designed for: Whether it's foil or fin, the most important is to get on the water and have fun. The F1e is the perfect balanced sail to have great performance both when using a foil or fin under your board. Once you decide between the wave-slalom model or slalom model.