Optimist MNR-1 Bi-Radial Mainsail Sailor's weight below 34 kg The Bi-Radial Series delivers a combination of excellent pointing and speed throughout a wide range of conditions. The bi-radial sail with its cross cut head offers a more easy-trim sail than the full radial models. This is the perfect Optimist sail for racers looking for pointing and keeping your head out of the boat. The MNR-1 Mainsail is our flattest sail in the bi-radial range, ideal for sailors below 34 kg. Standard Features Contender 2.99 Polykote with Radial Construction Mylar window Active leech Sail number installation IODA button Tell tales Sail bag Sail ties Optional Class measurement/certificate