The Boost itself has no physical appearance. However, its icon is presented as three purple arrows of increasing size aligned in a stripe.
The Boost item is a Pickup item that increases the user's speed without using Dash Panels or drifting. Dependent on the number of Boosts the racer possesses, the user can reach higher acceleration levels: if one Boost is used, the exhaust fire on the user's car becomes yellow, and if two Boosts are used, the exhaust fire becomes blue.
The Boost has several usages in gameplay: it can be used to gain a speed edge over other opponents while racing, evade Drones and Twisters (which makes it useful for "Battle Arena" challenges), cross sharp turns, and recover speed after getting slowed down. However, a low-level Boost can be canceled out with other Pickup items. Also, if a Boost is used while directly behind another racer, the Boost will be canceled out too.
Boosts can be gained by obtaining a Pickup item (which can give up to two Boosts), or a Super Pickup item which always gives three Boosts. To use a Boost, simply press the Weapon button when equipped with it. When holding multiple Boosts, the player can hold down the Weapon button to use them all at once: using two Boosts at once gives a level five boost, while using three at once results in a level six boost. These layered Boosts last for several seconds, during which time the player is immune to Drones and Twisters.