2.4.4.a An object is Boosted if it has at least one boost on it.
2.4.4.b Objects never directly gain or lose Boosted. This status changes when boosts are added or removed from an object.
Remark. Characters keep their boost when they change zones, except when they leave the Expedition, so if a player plays a Boosted Character card from their Reserve, that Character enters the Expedition zone Boosted.