Definitions for "Innerspring"
A mattress that includes tempered coiled springs. This type of mattress is the most popular. The insulation is layered several times with upholstery to provide comfort and cushioning. Some types of innerspring mattresses have each coil separately covered in a protective material for even more comfort and support.
The set of steel coil springs, bound together, that form the core of about 90% of mattresses in North America.