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BedInABox Tranquillium Mattress

Latest Promotions
Annual Sale Up to 25% off + free pillows* 25% off select mattresses & bundles, and up to 2 free plush pillows for Labor Day.
See offer

Essential Mattress Info

Mattress Type
Memory foam

Trial & Warranty

Trial Period
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Trial Period (nights)
Warranty Length (years)

Firmness Options

One Firmness Fits All?
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Adjustable Firmness
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Half-Half Firmness
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Selectable Firmness
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Flippable / Reversible Firmness
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Firmness Info

A firmer and supportive feel.

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.

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.

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.

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.

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.

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.

Manufactured in
United States


Side Sleepers
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Back Sleepers
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Size & Weight

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Twin Dimensions
75 x 38 x 12 "
Twin Weight (lb)
Twin XL
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Twin XL Dimensions
80 x 38 x 12 "
Twin XL Weight (lb)
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Full Dimensions
75 x 54 x 12 "
Full Weight (lb)
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Queen Dimensions
80 x 60 x 12 "
Queen Weight (lb)
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King Dimensions
80 x 76 x 12 "
King Weight (lb)
Cal King
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Cal King Dimensions
84 x 72 x 12 "
Cal King Weight (lb)

Certifications & Sustainability

Other Certification Info


Delivery Cost
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.

Latest Promotions
Annual Sale Up to 25% off + free pillows* 25% off select mattresses & bundles, and up to 2 free plush pillows for Labor Day.
See offer