VIPER 640 M-9 MAINSAIL Color:Gray Keeping the class girths at

Keeping the class girths at maximum helps to reduce lee helm at high speeds

The latest sail design incorporates a slight luff curve modification to induce shape and power down low

to a bi-radial construction this is a must-have sail for teams of all sizes

is easier to trim and more stable than any Day Sailer spinnaker ever designed

this mainsail is suited to both Selden and Southern Spars masts

VIPER 640 M-9 MAINSAIL Color:Gray Keeping the class girths atWith the same shape and twist profile as the M8, the M9 introduces a high tech aramid fiber layout inside the laminate film. Aramid is a stronger fiber so not only will this 2019 World Championship winning sail give you an advantage in durability, it will stretch less in big breeze and when you wail on your control lines making the sail more controllable.