The Duotone (used to be North) Gold mast is one of the lightest and highest performing masts in its class. The new Gold SDM mast comes with more carbon content in a 90% high-tech T700-Carbon. This mast is manufactured using the latest prepreg construction which aids in minimizing material and maximizing performance for you while you windsurf. The upgrades for this mast give you high performance, lighter weight, and strength capabilities for higher loads. This means you have an excellent wind range where your sail feels in control in higher winds.The Gold .90 SDM mast is a standard diameter mast making the rig feel solid and in control in higher winds. At 90%, this mast is also very light. A lighter windsurfing mast translates to better sailing control, quicker sail handling, and means less work for you overall! (You can sail that extra hour because you didn't overwork with a heavy mast and heavy rig!) This mast works great with most sails that have a constant curve.The Gold .90 SDM mast is a standard diameter mast with natural-white polyamide protection making it durable and great for bigger sails. Easy to rig, and ridiculously light for an SDM mast, you get great durability with this mast.