Boots of Springheel Jak (Item)

The Boots of Springheel Jak are acquired as part of the Thieves Guild quest of the same name. It also plays a part in the last quest involving the Thieves Guild, The Ultimate Heist.

Bugs
Permanent +50 to Acrobatics (Springheel Jak glitch) First you need to get the Thieves Guild quest "Boots of Springheel Jak" and complete the majority of the quest, retrieving the Boots. Do not, however, return the boots to the Gray Fox. Upon obtaining the Boots, equip them to get a +50 Acrobatics bonus, then travel to the Shrine of Sanguine and begin the Daedric quest there. Follow through that quest, and allow yourself to be arrested by Leyawiin guards when they try. All your possessions will be taken, except for key items (which include the Boots).

Stay your time in jail, and upon exiting, check your inventory. You should still possess the boots, but when you try to equip them the game will tell you "You cannot equip this item at this time". However, if you check your current enchantments, the +50 to Acrobatics will still be there. You can now wear other footwear, but still have the enchantment from the Boots of Springheel Jak.

This bug becomes even simpler with a Ring of Disrobing from the Shivering Isles expansion. Simply put the boots on, ex and re-enter the menus and put on the ring, exit the menus and allow the ring to remove the boots (and anything else you may be wearing) and, voila! permanent +50 to Acrobatics.