VIPER 640 M-9 MAINSAIL Color:Gray its full radial construction makes

its full radial construction makes this an excellent all-around performer

excels across a wider range of wind conditions and rig tunes

its breakthrough design has increased fullness for power yet is still controllable when the wind comes up

using the AP Main designed shape

hard finish racing dacron

VIPER 640 M-9 MAINSAIL Color:Gray its full radial construction makesWith 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.