The North Sails Optimist R-6 Radial sail delivers unparalleled acceleration and speed throughout a wide range of conditions. The Bi-Radial construction gives a more rigid sail than a conventional crosscut. The sail holds its shape and responds more sensitively to trimming and tuning changes. This is the perfect Optimist sail for racers looking to get the absolute most speed and versatility on the racecourse. The R-6 Mainsail is ideal for sailors below 44kg.