Serta iSeries 4000 Plush Review

Updated May, 2021
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The Serta iSeries 4000 Plush provides layers of body conforming memory foam, cooling carbon foam and fibers, and a high performing individually wrapped coil system to deliver an ultra comfortable and cool night's sleep. It's ideal for side sleepers, restless sleepers, and couples alike, and comes with a 10-year warranty.

Pick the Serta iSeries 4000 Plush if...

  • You want the support of coils and the comfort of memory foam. If you can't decide between choosing comfort or support when shopping for a new mattress, the Serta iSeries 4000 is a great choice. You'll get excellent support from 1025 individually wrapped coils while experiencing body cradling comfort from multiple memory foam layers.
  • You want to sleep cool. The iSeries Hybrid 4000 features a Max Cold cover, an UltraCold carbon memory foam system, and EverCool Fuze gel memory foam, which all work together to promote breathability and pull excess heat away from your body. You'll sleep comfortably cool each night.
  • You sleep on your side. If you're a side sleeper, the Serta iSeries 4000 Plush delivers the right amount of comfort and support for your sleep style. Your shoulders and hips feel cradled but your back remains supported for a comfortable sleep.

Seek alternatives to the Serta iSeries 4000 Plush if...

  • You need a sleep trial. The Serta iSeries 4000 Plush doesn't come with a sleep trial because it ins't available for purchase through Serta's website. If you need a sleep trial, consider Saatva instead. Saatva provides a generous 180-night sleep trial so you can be sure you've made the right choice.  


The Serta iSeries Hybrid 4000 has a plush firmness level, optimal for side and combination sleepers looking for shoulder and hip pressure relief. If you like superior cushioning and feeling more "in" your mattress than "on" it, the iSeries Hybrid 4000 caters to this preference.

Construction & Design

  • Max Cold Cover: This mattress cover is made from temperature regulating, high performance fibers that create a cool-to-the-touch sensation.
  • UltraCold System: This layer of extra-cool carbon memory foam channels excess heat away to keep the mattress comfortably cool.
  • Carbon Fiber Memory Foam: This high quality foam layer draws excess heat away from your body while providing optimal lumbar support.
  • EverCool Fuze Gel Foam: This cooling gel-infused foam layer further provides temperature control by increasing airflow and dissipating heat.
  • 1025 Hybrid Support System with Best Edge Foam: This advanced coil system uses individually wrapped coils that provide targeted support and adapt to your body's movements throughout the night. Best Edge foam encasement reduces roll-off and increases usable surface area.

Motion Isolation

This mattress's 1025 individually wrapped coils combined with quality layers of body conforming memory foam make the Serta iSeries 4000 Plush great at providing motion isolation. The coil system provides targeted support and reduces motion transfer across the bed, while memory foam layers absorb impact from sudden movements, allowing you to sleep undisturbed. it's a great choice for couples!

Edge Support

Like this bed's motion isolation performance, the Serta iSeries 4000 Plush performs exceptionally at edge support. The border of this mattress is encased in an extra deep high density foam rail which reinforces its edges. This means that more surface area can be used, and potential roll-off and sagging are greatly reduced.

Bed Frame Compatibility

The Serta iSeries 4000 Plush is compatible with any bed frame, as long as the frame is the correct size for the mattress. Serta does create bed frames specifically designed to work with their mattresses though, which may be something to consider when purchasing an iSeries.


The Serta iSeries 4000 Plush is only available through in-store purchasing, or through third party retailers, so shipping and returns are subject to this retailer's policies. The Serta iSeries 4000 Plush is protected by a 10-year warranty.

Why Buy the Serta iSeries 4000 Plush?

  1. You sleep with a partner. This mattress delivers excellent motion isolation because each coil moves individually, so you won't feel movement from the other side of the bed. Plus, memory foam layers absorb energy created by movement to neutralize the bed's surface. Less motion transfer means better sleep for you and your partner.
  2. You toss and turn in your sleep. If you're a restless sleeper, the iSeries 4000 Plush is a great solution. This bed relieves pressure points you commonly roll away from in worn down, uncomfortable mattresses, reducing the chances of your rolling. The memory foam layers hug your body's contours which encourages you to relax into the mattress and sleep soundly.
  3. You want a genuine US product. Each Serta mattress is designed and manufactured in the US, so you can rest easy knowing that your Serta iSeries 4000 Plush is a genuine US product made with quality materials and craftsmanship.

Why Avoid the Serta iSeries 4000 Plush?

  1. You don't want to buy from a third party retailer. Buying from third party retailers can make your purchase unnecessarily complicated. Sleep trials and warranties are subject to change, shipping is often pricey, and you don't get the peace of mind you receive when buying direct. Consider Saatva instead. You can buy any Saatva product with just a few clicks directly from their website!

Final Takeaway

The Serta iSeries 4000 Plush is a great option if you want plush comfort and advanced cooling. This mattress is also surprisingly supportive. You can get the Serta iSeries 4000 Plush for a great price, today!

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