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What do you mean by Active Support?


The basics of a good mattress are simple: combine the right amount of support and pressure relief and you’ve landed on a winning combination.

Pressure relief is a relatively easy concept to grasp because you can imagine something like a hip or shoulder sinking into a mattress.

Support is more difficult to understand because elevating an uneven structure, such as the human body, the proper amount, requires an active support system that contributes a delicate balance of rise and sink. That’s active support.

To get a better picture of Active Support, consider its opposite, passive relief, which is often found in foam layers. Passive relief means the weight applied will sink until a stable structure stops it going down.

Pressure relief is good to a certain point, but it needs to stop or the person’s body will melt into a mess. That’s where active support, which elevates, comes into play.

Active Support provides stability by contouring into the nooks and crannies of a person’s form so their body is supported. If left unsupported, a person’s muscles will fight for a neutral position, which leads to restlessness and no relaxation.   

Combine active support under a pressure-relieving surface and you have a winning combination that will deliver a good night’s sleep.

A Tale of Two Springs (Open v. Pocket)

There are two types of comfortable, supportive innersprings: open-coil and fabric-encased. What’s the difference, how are they made, and why does it matter?

Open Coil

To make open-coil innersprings, wire is fed through a coiler where steel is shaped into springs. The strands of springs are moved into an assembler where helical lacing is threaded through key parts of the springs to connect the coils and form a cassette. An operator then moves the spring core to a clipping station where a Leggett & Platt partner adds clips, often connecting a border rod. Once the open coil innerspring unit is complete, it is flat-packed for shipping.


To create ComfortCore® units, fabric is fed into the machine where the steel coils are inserted into partially formed pockets. Once a coil is placed inside, the pocket is ultrasonically welded and each spring is sealed inside an individual encasement. Coil strands are then fed into an assembler where a precision glue head applies adhesive to bond the strands together and form a full unit. Once the ComfortCore unit is complete, it is roll-packed for shipping.

Both innerspring units offer a unique level of comfort and support, but typically our ComfortCore fabric-encased units create a more individualized response for isolated motion transfer and localized contouring.

Our innersprings are used in the majority of mattresses sold in the United States of America and in many countries around the world.


Take a look at the main navigation to explore our products and learn about each unit.

See related articles: innersprings, sleep cooler, ActivEdge

Mark Kinsley

Mark Kinsley is Leggett & Platt's Staff Vice President of Marketing for the Bedding Group. Outside the office he enjoys spending time with family, mountain biking, hiking, and snow skiing. Connect with Mark on Twitter via @markkinsley.