Hi river,
The springs in the Easy Breather are pocket coils but if they are actually icoils then this is a trademark name that Zinus uses for their pocket springs. Zinus is a Chinese manufacturer that makes mattresses under many different brand names. The description doesn’t say anything about i-coils … only that it uses pocket coils.
I don’t know the specifics of the coils but a retailer/manufacturer would be the most reliable source of this type of information and if you are getting “mixed information” from different people (which could be because different sizes will have a different number of coils) then I would talk with Joe the owner who will give you accurate information. NOTE ADDED: They are also now a member of this site
Either way though the coil count of a mattress by itself is relatively meaningless and unimportant compared to how well the mattress as a whole matches your needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences). The coil count will also have little to do with the durability of the mattress because the comfort layers in a mattress are generally the weakest link in a mattress not the support layers underneath them (see this article and post #10 here about innersprings).
Phoenix