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iSeries Expression Firm Reviews

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iSeries Expression Firm

The extra firm iSeries Expression Firm is the firmest model in mattress manufacturer Serta's iSeries Hybrid Sleep System collection. The signature features of the iSeries Hybrid Sleep System are the Cool Action™ Dual Effects® Gel Memory Foam and Duet® Coil Individually Wrapped Coil-in-Coil Support System. This adds the sure support of a coil system to the contouring conformity of Serta's iComfort memory foam mattress comfort layers. The 13¾" iSeries Expression is the third highest iSeries Hybrid Sleep System model in height, but the second highest in price.
The polyester cover fabric of the iSeries Expression Firm is quilted to PilloFill and FireBlocker.

The iSeries Expression has three foam comfort layers. The top layer (1) is Serta's Cool Action™ Dual Effects® Gel Memory Foam. This is memory foam infused with two kinds of gel. MicroSupport®, as the name implies, is used to enhance the support of the foam, while MicroCool+™ is for cooling. Cool Action™ Dual Effects® has a higher proportion of gel than previous gel foams used by Serta.

Just beneath the Cool Action are two layers (2 and 3) of Serta® Support Foam. According to Serta, this foam "combines gentle cushioning with extra support, for more firmness at the sleep surface." These layers are a key to the extra firm comfort rating of this mattress.

Deep down support in the iSeries Expression Firm relies on the Duet® Coil Individually Wrapped Coil-in-Coil Support System. Individually Wrapped Coil-in-Coil Support System. Each Duet® Coil is two coils fashioned from one wire, a shorter, narrower coil within a taller, wider one. The outer coil has fewer turns, making it more responsive to light weight, while the inner coil has more turns, giving it a firmer response. This makes the support suitable for both lightweight and heavyweight sleepers. As independent pocket coils, the support is conforming for pressure relief and spinal posture. It also dampens motion transfer, reducing sleeper disturbance.

The recommended foundation for the iSeries Expression Firm is Serta's StabL Base. Mistakenly billed as a "box spring" by some retailers, it is really an upholstered platform with a steel frame and hardwood sheathing. This model is also compatible with adjustable beds, such as the Serta Motion Signature adjustable base.

Availble through several local, regional and national retailers, both online and in stores, the iSeries Expression Firm is covered against defects in manufacturing and materials by Serta's 25-year limited warranty. The first 15 years are non-prorated, while the remaining 10 are prorated.

  • Mattress and Bed Set Model Name

    iSeries Expression Firm

  • Price Category


  • Listed Manufacturer


  • Location

    Serta International, Customer Service Department, 3 Golf Center #392, Hoffman Estates, IL 60169, 1-888-55-SERTA (1-888-557-3782)

  • Bed Classification

    Hybrid - memory foam and coils

  • Level of Firmness

    Ultra Firm

  • Inner Bed Composition

    Dual pocket coils, 2 firm support foam layers, memory foam infused with both support gel and cooling gel

  • Mattress Edge Support

    Foam encasement

  • Mattress Cover Composition

    Polyester quilted with PilloFill and FireBlocker

  • Total Mattress Height

    13.75 inches

  • Bed Foundation

    Platform or adjustable bed

  • Special Features

    Dual Effect gel memory foam and 2-in-1 pocket coils

  • Sleep Trial

    120 days

  • Bed Warranty

    25-year limited warranty

  • Manufactured In


  • Restrictions

    Keep in sanitary condition, and provide proper foundation

  • Website


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