The Slash Mast 800 (carbon) is a great length for those learning to get on foil or who foil in shallow locations.
Mast Length: 31 in / 80 cm
The Slash Mast 900 (carbon) is great for those who have foiling experience. A longer foil allows for deeper carving and less pumping. It's also better for downwinding, keeping you above chop.
Mast Length: 35 in / 90 cm