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...
The new J-5 jib for the Viper 640 features the same proven winning shape as the J-4 jib. The new J-5 is made out of North Sails exclusive reinforced Xi14 Aramid laminate produced using the world’s most advanced sailcloth laminator and North's unique eXact™ process. The result is a high performance cloth with ultimate durability. North NPL Laminates
2019 & 2018 Worlds!
The North Viper 640 spinnaker reflects the knowledge we've gained by designing winning sails for a variety of sport boats. Our sail is sized to be class maximum and twists and rotates well, so you can sail lower angles while going the same speed or faster.