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Cal King Serta iComfort CF4000 Plush Mattress

Special Price $3,699.00 Regular Price $4,199.00

You Save 12% ($500.00)

Use our Mattress Size Guide to find the right size!


Mattress Size Guide

Not sure what size to get? Let us help you find the perfect fit. If you still have questions send us an email at [email protected] or call us at 1-800-863-9156.

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Cal King Serta iComfort CF4000 Plush Mattress

California King Serta iComfort CF4000 Plush Mattress

The Serta iComfort CF4000 Plush Mattress features the latest in comfort technology including the new Carbon Fiber Memory Foam layer that works to direct heat away from the sleeper, allowing you to maintain your body's optimal sleeping temperature. This unique foam is a blend of carbon fiber memory foam and NASA-inspired Phase Change Material (PCM) that provides unmatched support and pressure relief.

We rate this mattress a 6 on our comfort scale of 1-10 with 10 being firmest.

This model features a Max Cool Cover in which aids in temperature regulation by allowing the sleeper to be in direct contact with the high-performance cooling fibers, creating a cooler sleeping surface that enables the individual to fall asleep faster and stay asleep longer. This mattress also features the UltraCold System™, which adds an extra carbon fiber memory foam layer for double the heat dissipation, giving the sleeper a more comfortable night's sleep. The layer of EverCool® Supreme Memory Foam is a high-density, open-celled foam layer that is designed to gently conform and support the sleeper's body, resulting in even more pressure point relief. The Air Support Foam layer uses air cushion technology to support and comform to the curvature of the sleeper's body, relieving aches and pains comfortably and efficiently. The Serta® Foam Core provides this product with outstanding durability and support that drastically extends the life of the mattress, all while conforming to your body for all night comfort. This model is adjustable base compatible and comes with a 10-year warranty.

Order your new Serta mattress today and pair it with any of our incredible bedding options!


Comfort Type

  • Medium Firm
  • Comfort Scale 6

Comfort Layers

  • Max Cool Cover
  • UltraCold System™
  • Carbon Fiber Memory Foam
  • EverCool® Supreme Memory Foam
  • Air Support™ Foam

Base Layers

  • Serta® Foam Core

Box Spring and Adjustable Bases (Optional)

  • Serta Low Profile Box Spring 5"
  • Serta High Profile Box Spring 9"
  • Serta Motion Air™ Adjustable Foundation
  • Serta Motion Essentials™ V Adjustable Foundation
  • Serta Motion Perfect® Adjustable Foundation


  • 10 Year Non-ProRated Warranty Against Manufacturer's Defects
  • No Flip, No Rotate

Made in:

  • USA


Size Height Width Length
Twin XL 13.5" 38" 80"
Queen 13.5" 60" 80"
King 13.5" 76" 80"
Cal King 13.5" 72" 84"

Serta iComfort

Serta iComfort Mattresses are the latest in innovation and comfort. Using high quality gel memory foam and advanced cooling technology with temperature regulation, these models offer superior comfort and support. The 1000 models offer a cooling cover while the 3000, and 4000 models feature even more temperature regulating technology with several layers of active cooling for a cool and comfortable night sleep. Rest easy knowing Serta uses only CertiPUR-US Certified Polyurethane Foam. Backed by a 10-year warranty, Serta iComfort is changing the way America sleeps.

More Information
UPC Code747935850408
Sub BrandiComfort
Mattress Thickness12" - 14"
Mattress typeMemory Foam
SizeCal King

Delivery & Shipping

Free Shipping:

We offer FREE SHIPPING on bedding accessories purchases of $49 or more including sheets, pillows, comforters, mattress toppers and direct shipped memory foam mattresses. Bedding items in-stock usually ship within 1-3 business days.

FREE Local In-Home Delivery, Setup & Removal

($499 minimum purchase required)

Timing & Delivery:

We stock many items and can schedule delivery for the soonest available delivery time.  Often, we can even deliver the same day on in-stock orders placed before 2pm.  If you have any questions regarding delivery or availability, please call 1-800-863-9156 or visit our Bellevue, Kirkland, or Monroe WA store.

  • In stock items are usually delivered within 1-3 days within our local delivery areas (King, Pierce, and Snohomish Counties).
  • Items that need to be ordered from suppliers are usually delivered within 10-14 days from order date.
  • Nationwide white glove delivery is available on select mattresses and adjustable bases. Nationwide deliveries will be delivered in 2 weeks.
  • Nationwide front door shipping is available on Nectar, Number Beds, MLily, and other select mattresses.

Service Level:

  Gold Service Platinum Service Diamond Service
Availability Online & In Store Online & In Store Online & In Store
Price: $99.99

FREE w/$499 min purchase


FREE w/$499 min purchase


FREE w/$499 min purchase

Includes transportation, mileage & tolls
Mattress & boxspring setup
Removal of old mattress set
Removal of packaging
Setup of bedroom furniture and adjustable base    
Delivery & setup of up to three mattress sets  
Choice of preferred two-hour delivery window


You will be contacted within 24 hours of placing your online order to coordinate delivery. If all your items are currently in-stock, we may be able to delivery within 1-3 days. If any of your items need to be ordered, we will provide an estimate of when we will receive them at our warehouse. We schedule in a 2-hour window so you won't have to wait around all day, and we will give you a "heads-up" phone call when we are on the way the day of delivery. If you order by phone, and your items are in-stock, we can schedule delivery immediately.

Furniture & Bedding:

Furniture ordered at the same time will be delivered seperately, and may take additional time. If you would like to have all the items on your order delivered at the same time, please specify or contact us to let us know. Bedding will either be delivered with your order, or shipped via UPS or FedEx.

Free Delivery Zones

Local Delivery in Western Washington, Seattle and surrounding areas.

Is your delivery address outside this area? Contact us for a quote including delivery in your area. Some items are deliverable nationwide.


Please prepare your home for delivery:

    • Create a path for delivery. Clear any furniture, valuables or breakable items to avoid damage during delivery. Prepare your old mattress for removal by removing linens.
      You may be asked to sign a damage waiver if the delivery path is narrow or could create the potential for damage to your new mattress or home.
      We will remove one mattress and box spring for each mattress set purchased, and delivery professionals are unable to remove bedroom furniture, headboards, or other personal property.
      Someone over the age of 18 must be present for delivery.

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