In the 135 year history of Simmons mattresses I would say that have perfected their product and covered all the areas that normally break down and wear out. Their claim to fame is the “individually pocketed coil system” found in the Beauty Rest line that makes their mattresses good for couples that don't want to disturb their partner, and any one who wants a truly conforming sleep surface.
This type of coil system conforms to any shape thanks to the ability of each spring to work independently where most spring systems are connected or tied together causing roll together. The latest Simmons release is the “Beauty Rest Black” spring mattress which uses an exclusive three strand design featuring silk, wool, and alpaca comfort layers, true foam encasement for sleeping comfort right to the edge, layers of viscoelastic memory and natural latex foams, and circular knit fabric with 100% Natural Modal Yarn blended with exotic Cashmere.