Medial posting is the methodology of adding additional material on the arch-side of the shoe, theoretically to combat pronation-related issues.
In the case of Mizuno, what they do is add an additional layer of Wave to the medial side of the shoe as compared to the lateral one. It's different than the typical methodology, which is to use a different durometer foam on the medial side (that is usually grayed out versus the rest of the midsole). But the basic idea is the same.
The Elixir featured very little posting, which is why there was overlap with the Precision, which is why when they figured out the Sayonara was both neutral AND more stable than the Elixir, they merged the two lines together. They've basically made the Sayonara back into the Precision, and the Catalyst is the proper "stability" version now.
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