6 Inch Ultima Memory Foam Mattress Full - Medium Firm, Fiberglass Free

Our review of the 6 Inch Ultima Memory Foam Mattress in Full focuses on sleepers who want firm, targeted support in a compact, easy-to-handle package. The mattress delivers a medium firm feel that cradles the body without excessive sinking, and its patented 7-zone comfort system stands out as the single biggest reason to consider it: pressure is relieved at hips and shoulders while the rest of the body stays supported. It ships compressed in a smaller box, which reduces the footprint of delivery and makes setup simple for apartments or tight stairs.

Key Features

• Medium firm comfort: A balanced memory foam profile gives dependable support for back sleepers and those who prefer limited sinkage.
• 7-zone comfort system: Zoned foam targets common pressure points to ease strain on hips, shoulders, and lower back for more restorative sleep.
• Breathable airflow memory foam: The construction helps move air through the layers so the surface feels cooler than older solid-foam designs.
• Green tea and charcoal infusions: Natural infusions are included to help maintain freshness and reduce lingering odors over time.
• Certified safe materials: All foams are CertiPUR-US certified and the cover is OEKO-TEX certified, avoiding harmful chemicals in the mattress.
• Compact shipping: Delivered compressed in a smaller box to reduce carbon footprint and simplify handling during setup.

Who It's For

The Full 6 in Ultima is best for single sleepers, guest rooms, or smaller bedrooms where a supportive, low-profile mattress is useful. It suits back sleepers and those who prefer a medium firm surface that keeps the spine aligned without excessive contouring.

It is less suitable for couples who need deep contouring or heavier sleepers who may find a thicker mattress better for long-term pressure relief. Side sleepers who need a very soft surface may prefer a mattress with more plush layers for shoulder relief.

Pros & Cons

Pros

• Pressure-relieving memory foam with a targeted 7-zone system helps reduce aches across common areas.
• CertiPUR-US and OEKO-TEX certifications signal safer materials and manufacturing without harmful chemicals.
• Infused green tea and charcoal help keep the mattress feeling fresher after extended use.
• Arrives compressed in a smaller box for easier delivery and lower environmental impact.

Cons

• Firmness perception is mixed among users-some may find the mattress too firm or report initial off-gassing odors as it decompresses.
• At 6 in thick, this model may not suit heavier sleepers or those who want deep sink and plush layering.

Specifications

Brand	ZINUS
Size	Full
Thickness	6 in
Firmness	Medium firm feel
Materials	Memory foam with green tea and charcoal infusions
Certifications	CertiPUR-US foams; OEKO-TEX certified cover
Warranty	10-year limited warranty

Our Verdict

The 6 Inch Ultima Memory Foam Mattress in Full is a practical, value-oriented choice for solo sleepers and guest rooms who want supported, pressure-relieving rest without a bulky mattress. With targeted zoning, safe certifications, and freshness infusions, it offers good performance for its thickness and price, though those needing deep plush cushioning or extra thickness should consider a thicker model.

Frequently Asked Questions

How long does it take to expand?
The mattress should be allowed up to 24-72 hours to fully expand to its original shape after unboxing, with most of the expansion happening within the first day.

Does the mattress have a strong smell?
Some users report minimal off-gassing on first unboxing while others notice little to no odor; airing the mattress for a few hours speeds dispersion of any initial smell.

Is this mattress suitable for side sleepers?
Side sleepers who need significant shoulder cushioning may find the 6 in medium firm profile too firm; it is better suited to back sleepers or those who prefer firmer support.