Seasonal Skins
Seasonal skins should be available each season for a brief time every year.
1 Comments
A lot of them are. Unless they are considered Limited they can return at any time, and often do during their respective holidays, or be received in a Mystery Gift.
https://support.riotgames.com/hc/en-us/articles/201752944-Guide-to-Legacy-and-Limited-Skins