The folders are named "Use THIS Folder to Replace the InsertMiscNameHere", inside are each a "materials" and "models" folder, these are designed to be dropped into your \team fortress 2\tf\ folder.

Unzip the folder of your choice and drop it's contents into 

C:\Program Files\Steam\steamapps\*steam user name here*\team fortress 2\tf

Now, INVADE TEAM FORTRESS! Just don't probe any cows.

Note: yes I know about the clipping issues, at this time I haven't found a good solution, but some of the hats look great! Check out the Alien Swarm Parasite and the Gibus (which also clips, but not as bad)! Eventually I'll make it work with ALL Pyro hats, so watch for an upcoming re-release!

BY SKUNKROCKER
WITH HELP FROM:
Drax-Quin - Misc. help.

CHANGELOG
v1 - intial release