Updated March 23, 2021
Also known as wrapped coils, encased coils, encased springs, or Marshall coils, pocketed springs are one of the most commonly used construction materials for mattresses. These coils are springs formed from varying types of wire that are compressed within a fabric encasement. They're designed to provide proper support for your body while transferring very little motion.
While traditional coil systems have springs that are wired together, the springs in a pocketed coil system are individually wrapped in fabric encasements and perform independently from one another. This design allows each pocketed spring to react as needed, responding quickly to movement and conforming to the contours of your body.
Individually wrapped coils, or pocketed springs, work independently of one another so that you receive the right amount of support throughout your entire body. This design was created with the idea of a mattress being more responsive to a person's individual curves while laying down. Since not all people are built the same the thought was to create a system of coils under tension that would only compress so far depending on the amount of weight put upon each coil.
Wrapping the coils in fabric individually helped to ensure that neighboring coils would not compress too much or too little thereby causing discomfort. This fabric wrapping also helped to cut down on the noise associated with springs compressing and lessen motion transfer from sleep partners. Beautyrest first introduced this industry-altering invention in 1925 and it revolutionized mattress production and construction even to this day.
It's recommended that most adults receive roughly 7 hours of QUALITY sleep per night. If you think lying down and setting your alarm for 8 hours later is enough, it may not be. It only takes a few disturbances to break your sleep cycle and prevent your brain and body from ever entering the deep sleep needed to fully recuperate.
Minimizing these disturbances with a pocketed innerspring system is a great way to greatly improve the quality of your sleep. If you sleep with a partner, individually wrapped coils greatly decrease the amount of movement you'll feel when they shift during the night. This helps you stay asleep, which makes the quality of your sleep better.
Pocketed coil systems also help reduce tossing and turning because they're perfect for pressure relief. The coils can push down under your heavier areas while pressing up against the areas that need more support like your lower back. With a tied coil system, all the coils are grouped together meaning they all compress in an area where you need more support.