Spike Shoes are accessory items that can be bought from certain shops. They can also be found in crates on a semi-rare basis, and are occasionally dropped by the Yeti King.
They are not to be confused with Spring Shoes which have a similar sprite.
Spike Shoes will increase your effective stomp damage to 3, allowing you to kill high-health enemies such as Cavemen in a single hit.
They are also effective against certain enemies that are not usually harmed by jumping (such as Mantraps), and allow you to kill stunned enemies by jumping on them.
Spike Shoes can be worn at the same time as Spring Shoes, allowing for both effects at once.