The trimmed boots are not visually different from normal boots, though they do have an additional 8 armour (and a higher Defence requirement). They retain value mostly due to their rarity, and the Fortunate components they provide upon disassembly.
The boots were formerly known as just "wizard boots" until the update of 9 October2017, where they were renamed to "wizard boots (t)" to make way for the new, craftable boots added in the update.