We’re reader supported. If you make a purchase using the links included, we may earn commission at no extra cost to you!

comparison

BedInABox Tranquillium vs Serta iComfortECO Smooth Hybrid

Easily compare the Serta iComfortECO Smooth Hybrid vs BedInABox Tranquillium Mattresses side-by-side.

Latest Promotions
Spring Sale 25% off mattresses* 25% off bundles. Plus, free pillows with select orders. *Excludes the Essential mattress.
See offer
Bundle & Save Purchase any Serta® iComfortECO™ Mattress and get 1 Serta® Classic Bedding Bundle FREE. Add eligible items to cart and use code MATTRESSBUNDLE at checkout.
See offer

Essential Mattress Info

Brand
BedInABoxSerta
Mattress Type
Memory foamHybrid (coils and foam)
Prices
Video

Trial & Warranty

Trial Period
Icon check markIcon check mark
Trial Period (nights)
120120
Warranty Length (years)
2010

Firmness Options

One Firmness Fits All?
Icon check markIcon times
Adjustable Firmness
Icon timesIcon times
Half-Half Firmness
Icon timesIcon times
Selectable Firmness
Icon timesIcon check mark
Flippable / Reversible Firmness
Icon timesIcon times
Firmness Info

A firmer and supportive feel.

The base model (CF1000 Hybrid) is a medium comfort. Choose the cooling upgrade (CF2000 Hybrid) model if you prefer a firm feel. Both the Max Cooling Upgrade (CF3000 Hybrid) and Max Cooling & Pressure Relief Upgrades (CF4000 Hybrid) offer a selection of feels - medium and plush and firm and plush.

Mattress Construction

Materials Overview

A 3-layer construction:

  • 3" 3lb Density CoolRest® Memory Foam Infused with Liquid Gel
  • 2" Pluralux Foam
  • 7" 2lb Density Sure Align Support Foam
  • Smooth Knit Cover.

The Serta iComfortECO Smooth Hybrid is a hybrid mattress best suited for side sleepers. The materials used are up to 70% sustainable.

It has a layer of 5-Zone Quad Coil for support and targeted pressure relief. And two layer of memory foam that's breathable and provides reduced motion transfer for uninterrupted sleep.

You can select your level of firmness between :

  • Firm
  • Medium
  • Plush
Comfort Info

3 lb density memory foam rebounds (takes it shape) quicker making it easier to change positions.
The TENCEL® cover is a performance fabric like no other, absorbing moisture completely and naturally, creating a cooler and more comfortable sleep. With more breathability than cotton, and a softer hand than silk, TENCEL® can be found anywhere from athletic wear to luxurious bedding. Nothing is dreamier than going to sleep on a bed made with TENCEL® fibers.

Specifically designed mattress to keep even the warmest of sleepers cool. You don't have to be a hot sleeper to love iComfort. You just have to like your sleep environment to be refreshingly comfy. Three cooling upgrades available:

  • Cooling Upgrade (CF2000 Hybrid): 12.5" More airflow and a cooler sleep combined with firm support.
  • Max Cooling Upgrade (CF3000 Hybrid): 13" Cooler and more breathable.
  • Max Cooling & Pressure Relief Upgrade (CF4000 Hybrid): 14" Feels and sleeps cooler, with air support layer to take pressure off joints.

Support Info

Our CoolRest™ gel advanced memory foam quickly conforms to your body for pressure relief and support without letting you sink too far into the mattress.

A highly breathable and supportive mattress with a classic, responsive feel.

Comfort Specs

Open cell memory foam increases air flow, contributing to a cooler sleep.
Sure Align foam works in tandem with CoolRest® Gel memory foam and provides perfect support for long lasting comfort.

Every iComfort mattress is made with our exclusive Carbon Fiber Memory Foam. This system channels heat away from your body.
Gel Active® Max Foam (used only in CF2000 Hybrid model) is an open celled memory foam helps promote airflow, so you don't have that hot, stuffy feeling when falling asleep.
UltraCold System™ (used in the CF3000 Hybrid and CF4000 Hybrid models) The layer of extra-cool Carbon Fiber Memory Foam is engineered to work hard at absorbing excess heat from your body, then channel it away, all while you sleep comfortably.

Support Specs

CoolRest® Gel memory foam perfectly contours to your body providing improved pressure relief to reduce tossing & turning.
Sure Align foam designed to support & correctly align your spine so you can sleep better.

Carbon Fiber Memory Foam provides exceptional strength for back and neck support.
1025 iComfort® Hybrid Support™ System with BestEdge® Foam Encasement. In this advanced innerspring system, individually wrapped coils work independently to conform to every curve of your body and provide durable support. The foam encasement system is designed with an extra-deep foam rail to help reduce edge roll-off and extend the sleep surface.
Air Support™ Foam (used only in CF4000 Hybrid model) moves with your body and contours around it to help alleviate aches and pains caused by pressure points.

Fabric Specs

The TENCEL® cover offers unique moisture management properties - absorbs 50% more moisture than cotton, making it a highly effective performance fabric. Rapid absorption of moisture proves most effective in inhibiting bacterial growth naturally, without adding any chemicals.

A Max Cold™ Cover is used in the CF3000 and CF4000 models. Made from super cool high-performance fibers for an instant cool-to-the-touch sensation.

Manufactured in
United StatesUnited States

Suitability

Side Sleepers
Icon check markIcon check mark
Back Sleepers
Icon check markIcon check mark

Size & Weight

Twin
Icon check markIcon check mark
Twin Dimensions
75 x 38 x 12 "74.5 x 38 x "
Twin Weight (lb)
53
Twin XL
Icon check markIcon check mark
Twin XL Dimensions
80 x 38 x 12 "79.5 x 38 x "
Twin XL Weight (lb)
62
Full
Icon check markIcon check mark
Full Dimensions
75 x 54 x 12 "74.5 x 54 x "
Full Weight (lb)
76
Queen
Icon check markIcon check mark
Queen Dimensions
80 x 60 x 12 "79.5 x 60 x "
Queen Weight (lb)
90
King
Icon check markIcon check mark
King Dimensions
80 x 76 x 12 "79.5 x 76 x "
King Weight (lb)
113
Cal King
Icon check markIcon check mark
Cal King Dimensions
84 x 72 x 12 "83.5 x 72 x "
Cal King Weight (lb)
113

Certifications & Sustainability

Certifications
CertiPur-US®
CertiPur-US®
CertiPur-US®
Other Certification Info

Delivery

Delivery Cost
FREEFREE
Delivery Info

Typically, orders are shipped within two business days of receipt from our warehouse in Johnson City, TN via FedEx Ground. Delivery is usually 1-5 days depending on where you live.

Serta mattresses are shipped using the fastest, safest, and most reliable method possible. After ordering, you will be contacted by XPO Logistics to schedule a delivery day and time.

Prices
Latest Promotions
Spring Sale 25% off mattresses* 25% off bundles. Plus, free pillows with select orders. *Excludes the Essential mattress.
See offer
Bundle & Save Purchase any Serta® iComfortECO™ Mattress and get 1 Serta® Classic Bedding Bundle FREE. Add eligible items to cart and use code MATTRESSBUNDLE at checkout.
See offer