Boost

A Boost can be bought from the Riot Store using Riot Points, and temporarily increases the amount of Influence Points or Summoner Experience Points gained at the conclusion of each match. There are two kinds of boosts -- Duration Boosts and Wins Boosts.

Duration Boosts
Duration Boosts are active for a certain amount of time (for example, 1 day). Duration boosts double the base amount of IP received for any type of game win or lose, not counting other bonuses. Examples of those other bonuses which are not doubled include the First Win of the Day bonus, the match-made game bonus, or a bonus from another boost.

Per Win Boost
Per Win Boosts are only applied if you win a game and they will never expire. Per Wins boosts give you a flat amount of IP equivalent to the max base IP you can earn from a game (values are different for each game mode). This change was made to ensure players were getting the most out of their boost for extremely short games, but Riot hasn't updated the explanations of how Per Win Boosts work. Because of how Wins Boosts work they will give much less IP for Dominion, Custom and Co-op vs. AI games than they will for Summoner's Rift games. Tests have shown that Custom Games on Summoner's Rift provide more IP than Co-op vs. AI games on Summoner's Rift, even if only fighting 1 enemy bot (unlike the full 5v5 Co-op battle). Playing PvP on Summoner's Rift will maximize the IP gain from your per win boost.

Available Boosts
The Riot Store offers boosts for a specified number of wins and for specified durations.

Free Boost

 * If you combine a Duration Boost and a Per Win Boost, you will receive both bonuses as long as both active.
 * During special events, Riot has given the community free IP Boosts.
 * Under the original Refer A Friend program, a player receives a 4-Win IP Boost for having a referral reach summoner level 5.