Product Description

King Koil Extended Life – Onyx Tight Top Extra Firm

Built to last, the Onyx Tight Top Extra Firm from King Koil’s Extended Life collection delivers exceptional support, durability, and cooling comfort. Designed with resilient materials and backed by one of the best warranties in the industry, this mattress ensures years of restorative, undisturbed sleep.

Why You’ll Love It

Firm, Resilient Comfort
Graphite Talalay Firm Latex offers pressure relief and moisture-wicking comfort, while staying breathable, durable, and cool for years of consistent support.

Naturally Breathable Materials
The Silk Wool Blend keeps your sleep surface cool and comfortable while maintaining long-lasting durability and sustainability.

Advanced Support System
The 792 ContourPro Encased Coil System conforms to your body’s curves, relieves pressure points, and minimizes motion transfer so you can rest without interruption.

Extra Features for Peace of Mind

• Anti-Microbial Safeguard Fibers for a healthier surface
• Super High-Density Foam for added strength
• High Performance Foam for consistent, long-lasting comfort
• HD Foam Encasement for full edge-to-edge support
• Everlast® Base Foam for superior durability and stability

With the Onyx Tight Top Extra Firm, you’ll enjoy lasting durability, firm support, and a cooler, healthier sleep environment—night after night.

Mattress Specs

Comfort & Craftsmanship

Graphite Talalay Firm Latex

• Moisture-wicking, pressure-relieving support
• Natural & breathable
• Highly resilient & durable
• Wicks away moisture & heat

Silk Wool Blend

• Naturally breathable
• Durable cooling comfort
• Sustainable

Support System

792 ContourPro Encased Coil System

• Reduces motion disturbance
• Conforms to body’s curves
• Relieves pressure points

Additional Features

• Anti-Microbial Safeguard Fibers
• Super High-Density Foam
• High Performance Foam
• HD Foam Encasement
• Everlast® Base Foam

Warranty

One of the best warranties in the industry.

The King Koil Xtended Life Extra Firm mattress at Best Mattress in Las Vegas, NV, and St. George, UT, is designed for sleepers who want uncompromising support, long-lasting durability, and a cooler, deeper night’s rest. With a precise balance of advanced foams, resilient coils, and cooling latex, this mattress delivers the kind of restorative sleep that helps you feel strong, energized, and ready for the day.

Certified for Peace of Mind

Every layer of foam in this mattress is CertiPUR-US® certified, meaning it’s free from harmful chemicals, safe for your home, and engineered to perform for years.

Sizes to Fit Every Bedroom

– Twin: 38″ x 75″
– Twin XL: 38″ x 80″
– Full: 54″ x 75″
– Queen: 60″ x 80″
– King: 76″ x 80″
– Cal King: 72″ x 84″

The King Koil Xtended Life Extra Firm mattress isn’t just a mattress—it’s a long-term investment in your sleep health. With unmatched durability, cooling comfort, and tailored support, it’s the ideal choice for anyone seeking rejuvenating rest, night after night.