Viper 640 M-8 Mainsail

All Purpose

The new M-8 mainsail for the Viper 640 features the very same design and shape of the world winning M-7 mainsail. Because North Sails is always improving and seeking for better products, our sail designers made a recommendation for a cloth switch to Xi-18 which will hold the sail shape longer, with a substantial durability improvement for an overall better mainsail.

Standard Features

  • Sail numbers
  • Insignia
  • Trim stripes
  • Vision window
  • Jib leech window
  • Sail bag


  • Extra set of battens