Connected-Coil Mattresses
Individual Pocketed-Coil Sets

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 Connected Coil: The connected coil system connects each row together with helical wires. Each coil unit is made of a single wire attached to the next row by helical wires. This type of coil is often made into a lattice of coils rather than rows, allowing more coils per mattress than other constructions. This design allows each coil to distribute weight to a great number of springs resulting in less stress on each coil. Mattresses with connected coils last much longer and are less susceptible to sagging over individual coils. Serta uses a continuous coil system unlike any other company, in which a single metal wire makes up an entire row of coils which has proven itself to help its mattresses last longer than 10 years. 

Pocket Coil/Individual Coil or Marshal Coils: A pocket or independent coil is a cylindrical spring wrapped in its own fabric pocket. This construction is designed to give the most contour of any support system. Each coil works independently which means that you will feel your partner move much less. Each pocket coil absorbs the weight placed on it without distributing the load to other coils. Because of this, it is possible that the coils will provide less support over time, particularly for heavier people. This type of coil is a good choice for people who toss and turn and for their bed partners because the motion separation may prevent waking from a deep sleep which is very important for well being. Spring Air, Serta Perfect Sleeper Elite and iComfort Collections, Restonic, and Savvy Rest use this type of coil in certain collections of their mattresses with reinforcements added to help increase longevity.

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