White Optimist sleeve sail with reef, ideal for sailing schools. When using the reef eye, the boom goes up and gives more headspace for the sailor. A sleeve pocket for the Optimist mast at the luff with a cut out for the sprit halyard block. This sail is made of strong 3.8 oz high quality 100% dacron sailcloth. This Optimist sail has 4 heavily reinforced corners, a loose foot and webbing loops at both the tack and the clew point to accommodate the boom. This Optimist sail does not have any sail battens. Best to use with the fixed sleeve school mast set EX1053.