Why some skins not avaliable?

Why some skins not avaliable ? Ex:New Pool Party skins ; Tham khench skin ;Gentelman Gnar not avaliable too. Why this skin not avaliable,.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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