How long does it take for the mattress to fully expand after unpacking?

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.

Can I use your mattress with an adjustable bed frame?

It is not recommended to use a hybrid mattress on an adjustable bed frame as there are springs inside the mattress.

Are the high densityfoam mattress suitable for all sleeping positions?

Yes, the mattress is designed to accommodate various sleeping positions, with a medium hardness feel that meets the sleep preferences of most people.

SIMARTH Professional After-Sales Support

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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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

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

Product ID: 672345383

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Details

Brand
SIMARTH
Size
King
Product Dimensions
80"L x 76"W x
Top Style
Euro Top
Cover Material
Euro Top and
Number of Layers
8

🌀Gel memory foam for cooling comfort

🛏️12-inch hybrid design

🛡️Reinforced pocketed springs for edge support

Description

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

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.

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.

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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