Halcyon Contour Sidemount SystemContour Sidemount System After months of collaboration with some of the worlds top sidemount divers, we are proud to offer the Contour Sidemount System. The Contour comes from the factory as a turnkey sidemount system. This system has a unique wing shape that moves your center of gravity farther down, accommodating the lower sidemount cylinders and making it easier to trim out for the SM diver. The Contour Sidemount System also allows for a side slung