The new F-4 Mainsail is designed for the Solo sailors from 90kg upwards. The F-4 is fuller and more powerful than the P-4 design and this updated design allows for more forgiving trim than previous full cut sails. The sail shape was adjusted throughout to allow for it to be easier to depower in strong conditions and also help the sail to twist in the upper leach in lighter conditions whilst maintaining its strong downwind and reaching performance which is always the hardest part of the course for the heavier sailors.

The F-4 complements a wide range of mast sections (Cumulus | Zeta | D | M2 | M7 | C Sleeved).