Most people are familiar with innerspring mattresses because their own mattresses are designed with springs or coils. (kaboutjie.com)
As for innerspring mattresses, manufacturers often equate the number of coils with firmness, but the gauge of the wire is just as important. (babycenter.com)
Based on your personal preferences, there are a wide variety of innerspring mattresses from which you can choose. (sleepmetro.com)