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Speed Boosts are high speed shoes found in the Sonic the Hedgehog series. It resembles one of Sonic's shoes.
In Mario & Sonic at the Olympic Games, they are used as items in Dream Events such as Dream Race and Dream Long Jump throughout the game. The player can use them to automatically speed up for a set period of time. It is similar to the Mushrooms in the Mario Kart series.
In Mario & Sonic at the Olympic Winter Games, they return once again in Dream Event where they are now called High Speed Shoes. They are used the same way as in the previous game.