River is one of Latitude 64's most popular discs. And this thing has GLIDE. It is easy to throw and fits most player’s power and skill levels. River is a fairway control driver and while it is not the fastest disc Latitude 64 has made, and does not have the widest wing ever made, it is a disc for accurate driving and good control. With small fade and amazing glide, you can really let it fly on those big anhyzer curves.
Opto Air uses the same material as the durable Opto Line plastic. It is modified and the runs are done in a different way to achieve a stunning result of lighter weight discs that still has a layer of solid plastic at the tip and bottom of the rim to protect the alternated material that is mostly centered in the middle of the rim but also spread out slightly over the top of the discs to keep the weight distribution as close as possible to the Opto and Gold Line discs.