Spider's Boots

Spider's Boots are boots unlocked at. It is the only piece of armor that grants the wearer vertical mobility and fall damage immunity (as long as you have at least 50 ) as of version 0.7.4, along with its upgraded form, the Tarantula Boots.

It's also part of the secret Monster Hunter Armor set.

Crafting
After collecting 25k String, the Spider's Boots Recipe will be unlocked.

Requires 256 Enchanted String to craft (49152 String / 768 Stacks of String), which equates to  when buying from the Adventurer NPC. Currently, it is String from the Bazaar because you can only buy 10 stacks of string from the Adventurer NPC due to the Bazaar being added to increase player trading.

Trivia
You can also fly if you use a Grappling Hook with an Aspect of the End as well as an Aspect of the End with Spider Boots. But keep in mind that if you were to fly with an Aspect of the End and spider boots it would consume more mana
 * Combined with the Grappling Hook, you can fly.
 * For best effect, look straight up when double jumping.