The P-4 Mainsail is medium design sail for sailors between 34-43 kilos. It has been added to the range of North Optimist sails after extensive testing and very positive feedback. It is a very easy to use radial design, developed along the same principals as the P-5, but slightly flatter. It was used successfully to win the girls Optimist Worlds in 2008. The sail comes with numbers, battens, window, IODA button, tell tails and sail bag.