FOLVUTY FirmLux 4 Inch King Extra Firm Mattress Topper

Product Overview

FOLVUTY 4 Inch Black Extra Firm Mattress Topper King – A Slim Comfort Layer for a Firmer, Cooler, and More Stable Sleep Surface

The FOLVUTY Black Extra Firm Memory Foam Mattress Topper is designed for sleepers who want to refresh their mattress without adding too much height. Available in Queen and King sizes, this slim 4 inch mattress topper adds a supportive comfort layer to memory foam, hybrid, and innerspring mattresses, making it a practical choice for bedrooms, guest rooms, apartments, dorms, and RVs.

Made with 45D high-density memory foam, this firm mattress topper helps improve the feel of an old, soft, or slightly unsupportive mattress. Its dense foam structure helps reduce excessive sinking while adding balanced support for the lower back, hips, and legs, creating a more stable and comfortable sleep surface.

The cooling gel-infused memory foam works together with a perforated ventilated design to promote airflow and help reduce heat buildup. This breathable mattress topper is ideal for sleepers who want firmer support with a cooler, drier feel throughout the night.

A layer of bamboo charcoal memory foam helps keep the topper feeling fresher over time by reducing unwanted odors. The removable, machine washable cover makes daily care simple, helping maintain a cleaner and more comfortable sleep environment.

Designed for better stability, the FOLVUTY King size mattress topper features adjustable corner straps and a non-slip bottom to help keep it securely in place on different mattress types. The slim profile is easy to set up, easy to move, and suitable for use as a mattress pad topper, bed topper, or firm memory foam topper.

Made with CertiPUR-US certified foam and OEKO-TEX STANDARD 100 compliant fabric, this fiberglass-free mattress topper offers a safer and more practical way to upgrade your bed. With firm support, cooling comfort, easy maintenance, and dependable everyday durability, the FOLVUTY Black Extra Firm Mattress Topper is a simple solution for improving sleep comfort without replacing your mattress.

Available Sizes & Weights

3" Queen: 80" × 60" × 3" – Approx. 29.60 lbs

3" King: 80" × 76" × 3" – Approx. 41.49 lbs

4" Queen: 80" × 60" × 4" – Approx. 29.60 lbs

4" King: 80" × 76" × 4" – Approx. 41.49 lbs

Key Features

• 【Firm Support Designed for Real Back Support】This 4 inch thick mattress features a 45D high-density foam core, creating a truly stable sleep surface. Unlike soft toppers that lose support over time, this firm mattress topper helps reduce mattress sagging and supports healthy spinal alignment. Ideal for heavier sleepers, office workers, and anyone who wakes up with lower-back or hip discomfort and wants reliable, long-lasting support.
• 【Cooling Gel Comfort That Does Not Trap Heat】The cooling mattress topper combines gel-infused memory foam with a perforated ventilation structure to actively improve airflow and release trapped heat. This design keeps the surface cooler and more breathable, helping warm sleepers stay comfortable through the night without the stuffy feeling common in dense foam toppers.
• 【Cleaner Sleep with Bamboo Charcoal Foam and Washable Cover】Bamboo charcoal fibers are infused into the high density foam core to help absorb unwanted odors and support a fresher sleep environment over time. Paired with a soft, hypoallergenic cover that is removable and machine washable, this bamboo mattress topper is easy to maintain and ideal for everyday use in bedrooms, guest rooms, apartments, and homes with pets or frequent washing needs.
• 【Secure Non Slip Fit That Stays in Place All Night】Adjustable corner straps and a non slip bottom keep the topper firmly positioned on memory foam, hybrid, or innerspring mattresses. No sliding, no bunching, and no nightly readjustment, just a smooth, stable sleep surface that stays where it belongs.
• 【Certified Safe Materials with Worry Free Trial】Made with CertiPUR US certified memory foam and OEKO TEX STANDARD 100 compliant fabric, this memory foam mattress topper is fiberglass free and designed for safe, toxin free sleep. Vacuum packed for easy delivery and setup, it fully expands within 48 to 72 hours. Backed by a 120 night trial, 10 year limited warranty, and 24 hour customer support, so you can upgrade your sleep with confidence.

Specifications