Hi, new to the forum and new to printing.

I customize shoes but is not enough of a standalone business for me so I am going to start printing tees/clothing also to help me through the quieter times, and also to expand my services.
I have read through all the faq's and am confident that when the time comes, I will be able to use the basics and teach myself the rest.
One thing I saw online was this
Scull N Dice 2/3/4 & Fifteen Minutes converse - Hypebeast Forums
I had no idea how it is done - I mean, surely the shoe hasnt gone in to a normal heat press.... any ideas or tips for me?
Thanks!!!