“Shoes that increase movement by 2.” —In-game description, New Mystery of the Emblem
The Boots (ブーツ Būtsu, also known as the Leg Ring and the Swiftsole), are a Stat booster that recurs across the Fire Emblem Series. When used, the Boots increase its user's Movement by 2 points. In earlier titles, the Boots increased movement by 4 points instead, making its effect more valuable.
In Fire Emblem: Genealogy of the Holy War, the Boots are replaced by the Leg Ring (レッグリング Leggu ringu). The Leg Ring must be placed in the inventory of any unit for its Movement-boosting effect to take place. The Boots are also known as the Leg Ring in Fire Emblem: Thracia 776, although this incarnation of the ring is expendable, permanently increasing its user's Movement when used.
Boots most benefit the Lord unit or a utility character, such as a Thief or a Dancer. Alternately, slower classes, such as the Ballistician or the Knight/General classes, may benefit from being given the Boots to improve their poor movement range. The Boots are conversely given to high-movement units in order to further maximize their battle efficiency. This is especially true in Awakening and Fates if you give Boots to a unit with Galeforce.