How do you wipe a phone back to factory?

[Dubbayoo]

I've purchased a 32GB Moto X so I'll be giving my 16GB Moto X to my ex. I want to be sure I get all my stuff off before handing it over.

It's not rooted, unlocked or anything.

 

[Javier P]

https://motorola-global-portal.custhelp.com/app/answers/prod_answer_detail/a_id/94936/p/30,6720,8696

Moto G from ACF