The Tempest Gloves are a level 90 Ranged tank hands slot item, part of the Tempest equipment set. They can be purchased for 6500 Teci (rewarded for completing Raids) from the Armoursmith in Mazcab. Besides Daemonheim-only armour, they offer the best defensive bonuses for any item in their slot, tied with other Raids equipment.
The tempest gloves degrade to dust after 100,000 charges of combat, and cannot be repaired. Fighting in Raids does not degrade them at all. When wearing the full regular or Achto Tempest set, or a mix of the two, there is a chance that all of your defensive abilities will have their cooldowns reset. Wearing the tempest gloves also doubles the chance of getting the Achto Tempest Gloves as a drop from one of the Raids bosses. If you die in the Wilderness with the tempest gloves, it will drop 3,000,000 coins instead of the item.