The Severne FGO high performance windsurfing sail is the ideal platform for young sailors to get competitive and strive for Olympic gold. The FGO is a lightweight racing machine, with strong reinforcement in vital areas. This sail covers a wide wind range and is specially designed to be used on the foil, however can sail on fin no problem. the U15 division uses the 5.0 and 6.0 while the U17 can use the 5.0, 6.0 or 7.0. So depending on your weight and skill you will be able to choose the right sail for you. With only 4 battens and lightweight construction, the physical weight of these sails is significantly less. For foiling this makes maintaining trim much easier and overall more fun. These characteristics also make the sail soft and easy to get up onto the foil.