Boots of Mobility are an advanceditem in League of Legends.[1] They are often favored by players for ganking or pushing as it allows incredibly fast movement between lanes. This item also gives roamers faster transition between lanes.
Dealing or receiving damage from any source (including champions, monsters, towers, and minions) counts as combat and will result in the base movement speed bonus of 45. The application of any non-damaging combat debuff (such as exhaust) to an opponent will trigger this state as well. If invulnerable (such as being under the effects of Kayle'sIntervention), then autoattacks and non-cc abilities will not trigger this state. Heals, and buffs to allies are not counted as combat. The 105 movement speed bonus will be restored once a champion has not been part of a combat triggering event for 5 seconds.
There is no range limitation for damage dealt for the induction of the combat state and damage over time spells and abilities reset the timer for each tick of damage.
This item is especially useful if you don't have a Teleport to switch lanes.
This item is good in particular early-mid game on roaming champions, that want to quickly gank different lanes. They lose most value when team fights start to happen. It also allows for chasing and escaping.