If you windsurfing, you should be looking for a durable surf mast or a wave mast. Masts are generally made up of fibreglass and carbon-fibre strands held together with epoxy resin. Higher carbon content, althought more expensive, makes up for a lighter mast since less fibreglass is needed, but without any sacrifice in durability. As a bonus, a higher carbon content also makes for a snappier mast that moves through its flex cycle faster, allowing your sail be more responsive to the wind. Buy a mast that will fit your sail perfectly. The easiest way to know if your mast will fit is to buy the one recommended by the sail’s manufacturer.