The coil gauge is a measure of the thickness of the wire used to make the coil. The lower the gauge, the thicker the wire, and the higher the gauge, the thinner the wire. On average, the coil gauge in a mattress range from 12 to 15.
If you have a lower gauge coil, it will be stronger, heavier, and stiffer, and likely result in a firmer support.
If you prefer more give and bounce in a mattress, you may prefer a higher gauge coil.
Although the coil gauge is a good indication of the quality of the coils in the mattress, other factors such as the quality of the foams used in the top layers are equally as important, because those parts typically wear out much faster than the coil system in the mattress.
