The bonnell coils and continuous coil innersprings differ slightly from one another. Both are referred to as a traditional innerspring system. In a traditional innerspring system, a single wire is worked all throughout forming the springs, so they are all connected. These innersprings are usually found in lower to mid-priced mattresses. Reason being, they aren’t designed to be as supportive, contouring, or durable. Most national brands will feature these innersprings in their entry level models, before advancing to a pocketed coil innerspring in mid to higher end models. These mattresses are most ideal for a guest room, dorm room, or children who will outgrow their mattress before the coil loses it’s supportive qualities. A mattress with a traditional innerspring usually has an average lifespan of approximately 5 years, and rarely up to 10 years.