---
product_id: 672345383
title: "Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm"
brand: "simarth"
price: "5561.75 DT"
currency: TND
in_stock: true
url: https://www.desertcart.tn/products/672345383-firm-king-mattress-12-inch-king-size-hybrid-mattresses-in
store_origin: TN
region: Tunisia
---

# Gel memory foam for cooling comfort 12-inch hybrid design Reinforced pocketed springs for edge support Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm

**Brand:** simarth
**Price:** 5561.75 DT
**Availability:** ✅ In Stock

## Summary

> 🛌 Sleep like royalty with the Firm King — where comfort meets cutting-edge support!

## Quick Answers

- **What is this?** Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm by simarth
- **How much does it cost?** 5561.75 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/672345383-firm-king-mattress-12-inch-king-size-hybrid-mattresses-in)

## Best For

- simarth enthusiasts

## Why This Product

- Trusted simarth brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Risk-Free Rest:** 100-night trial and 10-year warranty backed by 100,000 pressure tests for lasting quality.
- • **Edge-Guard Technology:** Reinforced pocketed springs prevent sagging and keep your sleep surface stable all night.
- • **King-Sized Convenience:** 76" x 80" fits most beds, ships compressed in a box for easy setup—unpack and sleep!
- • **Cool & Breathable Sleep:** Soft knit fabric and gel memory foam wick away heat so you wake up refreshed.
- • **Pressure-Perfect Comfort:** Medium-firm layers contour your body to relieve pressure points and banish fatigue.

## Overview

The Firm King Mattress is a 12-inch hybrid king-size mattress combining gel memory foam and reinforced individual pocketed springs to deliver medium-firm support, pressure relief, and edge durability. Designed for all sleeping positions, it features breathable knit fabric to maintain coolness and ships compressed in a box for easy setup. With a 1100 lb weight capacity, 100-night trial, and 10-year warranty, it’s engineered for lasting comfort and quality.

## Description

Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm

## Features

- 【PRESSURE RELIEF】- This medium firmness King mattress features multiple support layers that allow the mattress to precisely fit every inch of the body, spreading pressure evenly to all parts of the body, relieving pressure points and eliminating body fatigue and pain.
- 【POWERFUL EDGE SUPPORT】- The King size mattress is upgraded with reinforced individual pocketed springs that provide strong edge support to prevent sagging. Provides enough support for the correct alignment of your spine, absorbs motion interference between partners and gives you a complete night's sleep.
- 【STAY FRESH AND COMFORTABLE】- This is a high density foam mattress designed for all types of sleepers. Designed with soft and breathable knit fabric and multiple memory foam layers, it keeps you from feeling overheated during the night, suitable for all sleeping positions and waking up feeling refreshed.
- 【KIING SIZE MATTRESS IN A BOX】- The Hybrid King Size Mattress measures 76 "W x 80 "D x 12 "H and has a maximum weight capacity of 1100 lbs and fits most full size beds. The mattress comes in a boxed compression package and can be installed by yourself, simply place it on the desired bed and unpack it.
- 【QUALITY ASSURANCE】- This King size mattress comes with a 100 night trial and 10 year support and has been pressure tested 100,000 times for quality. For a perfect sleeping experience, it is recommended that you return the mattress to its optimal condition within 24 hours.

## Product Details

- **Brand:** SIMARTH
- **Size:** King
- **Product Dimensions:** 80"L x 76"W x 12"Th
- **Top Style:** Euro Top
- **Cover Material:** Euro Top padding and Skin-friendly fabric
- **Number of Layers:** 8
- **Fill Material:** High density foam and individual pocketed springs
- **Weight Limit:** 1000 Pounds
- **Special Feature:** Euro Top padding and Skin-friendly fabric
- **Color:** White, Black

## Images

![Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm - Image 1](https://m.media-amazon.com/images/I/71eCOO0weFL.jpg)
![Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm - Image 2](https://m.media-amazon.com/images/I/81oSdjooCuL.jpg)
![Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm - Image 3](https://m.media-amazon.com/images/I/71ItYRwQz-L.jpg)
![Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm - Image 4](https://m.media-amazon.com/images/I/71YGaPTjNdL.jpg)
![Firm King Mattress 12 Inch King Size Hybrid Mattresses in a Box Upgrade Strengthen King Mattress with Gel Memory Foam and Individual Pocketed Springs for Support & Pressure Relief, Medium Firm - Image 5](https://m.media-amazon.com/images/I/71C6fASg9KL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: How long does it take for the mattress to fully expand after unpacking?**
A: Our mattresses are compressed for convenient shipping. Once unpacked, they typically reach their full shape within 24 to 72 hours. It's recommended to allow some time for the mattress to fully expand before use.

**Q: Can I use your mattress with an adjustable bed frame?**
A: It is not recommended to use a hybrid mattress on an adjustable bed frame as there are springs inside the mattress.

**Q: Are the high densityfoam mattress suitable for all sleeping positions?**
A: Yes, the mattress is designed to accommodate various sleeping positions, with a medium hardness feel that meets the sleep preferences of most people.

**Q: SIMARTH Professional After-Sales Support**
A: Our mattresses come with a 100-night no-risk trial and 10-year support, and have passed an industry-leading 150,000 pressure tests for the ultimate in quality. Contact our professional team with any questions or concerns about your mattress!

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**Shop now:** [https://www.desertcart.tn/products/672345383-firm-king-mattress-12-inch-king-size-hybrid-mattresses-in](https://www.desertcart.tn/products/672345383-firm-king-mattress-12-inch-king-size-hybrid-mattresses-in)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-02-01*