Spiked boots are boots that can be obtained by bringing Dunstan an iron bar and a pair of climbing boots (not rock climbing boots). Dunstan will only help after a player completes a required portion of the Death Plateau quest.
If you completed Death Plateau before the Burthorpe update you will need to redo the quest, then the chat option will show when you talk to Dunstan.
These boots are used during Desert Treasure while trying to obtain the Ice Diamond on the Ice Path segment. After the quest they are useless. The spiked boots are unequipable, except during portions of Death Plateau and Desert Treasure.
They were graphically updated with the Troll Warzone update on 31 January 2012.