The Star M-27 mainsail is an all-purpose sail built primarily out of a 3.8oz Dacron and manufactured with radial head and clew and a cross-cut mid sections. The M-27 is fast throughout the wind range with standard rig tune adjustments. An easy to trim sail the M-27 mainsail nicely fits all the masts sections, and is a must-have sail to cover all wind ranges.