The phrase "nice zip" means a smooth and fast movement or action. It is often used to compliment someone's speed or efficiency.
Sentences with «nice zip»
In the box you get a really nice zip up hard case that protects the controller and all its accessories for when it's not in use. (mkaugaming.com)
It looks nice zipped up or not, and would be nice whether you're pregnant, nursing, in the sticky - fingers phase of momhood, or beyond. (corporettemoms.com)
It also looks really nice zipped all the way up because of the collar but in all those pictures the top of my head is cut off! (whenthegirlsrule.com)