First developed in the 19th century from the buggy spring, this particular coil configuration is the most widely "consumer tested" innerspring on the market.
Its "knotted" hourglass shaped coils ") (" are "laced" together with spun "helical" wires at the top and bottom ("foot") of each coil. The entire shape of the unit is defined with heavier gauge "border wires" that are generally clipped to outer perimeter coils.
In certain configurations (coil count, wire gauge) this unit is extremely durable and can take quite a number of years of rigorous use before eventually losing its "temper memory".
Because of its wide availability due to many sources of supply (including offshore manufacturers) this unit's pricing is very competitive and, therefore, is used quite frequently in promotionally priced products. But, because of its durability, it is also used quite frequently in hotel and motel applications, university dormitories, and, yes, even in upscale bedding.
Please note, these are approximate sizes. We invite you to visit one of our Northwest Bedding locations to see exact mattress sizes!