When wielded, 50% XP boost is given at the entrance or outside of the Wilderness, with the buff increasing to 300% (4x the experience) at level 47 Wilderness just south of the fence. Most XP modifiers stack multiplicatively with the gloves (i.e. Clan avatars gives up to 106% XP and Brawling gloves are 400% XP, for a total 424% XP). The gloves do not work during Double XP weekends or with the Enlightenment aura. The gloves last for approximately 400 fish caught. You can check the charges left (as a percentage) by right clicking the brawlers and selecting "check charges".