This built-to-last sideshore wave sail features all x-ply body panel construction with a sized vinyl window for an 'all clear' view. Built smart, not heavy, the most durable of the Simmer line-up, this sail has a smooth feel, easy on off power, yet has the tuning ability to make it a remarkably rangey sail for its type. It pumps up easily, flexes off to control the gusts, and has a well focused draft, down and forward-- right where you want it. You can forget about this sail in your hands, so it lets you focus on the moment.... X-flex is the sail of choice for top performance and the highest level of durability in 'heavy water' surf conditions. It is also an excellent choice for lighter/smaller riders in any conditions with its short boom length and easy handling characteristics.