Zero cost collars at the surface are sold as collars that due to selling an option with the received premium and with that premium purchasing an option have no cost.  That obviously is incorrect as they do not have any upfront costs but certainly have a cost inside the collar.  They certainly can limit risk but often are quite expensive.  They are however useful to limit cash flow.

As a corporation, do you use zero cost collars?  What attracts you to them?