Signature Design California King Chime 12 in Medium Firm Gel Memory

Our review of the Signature Design California King Chime 12 in mattress finds it best suited for sleepers who want a balance of contouring comfort and stable support. The single biggest reason to consider this mattress is the layered gel memory foam construction that targets pressure relief while keeping motion transfer low, making it a sensible pick for couples and back sleepers who wake from pressure points. The mattress ships compressed in a box for easy setup and is fiberglass free with green tea and charcoal gel additions for a fresh-feeling sleep surface.

Key Features

• Gel memory foam layer: Conforms to the body to ease pressure at shoulders and hips for more restful sleep.
• 12 in profile: A mid-height build that combines plush top layers with a denser support core for durability and structure.
• Medium firmness: Offers a balanced feel that supports spinal alignment while still providing noticeable contour.
• Reduced motion transfer: The high-density support foam base helps isolate movement so partners are less likely to disturb each other.
• Fiberglass free construction: Safer handling and disposal with materials that avoid fiberglass, while added green tea and charcoal aim to help control odor.
• Boxed delivery: Arrives compressed for easy setup; simply unroll and allow up to 48 hours to fully expand.

Who It's For

This mattress is a solid option for couples and back sleepers who appreciate pressure relief and want reduced motion disturbance. The medium support and contouring feel suit people who favor a responsive surface that still maintains underlying support, and the California king dimensions work well for taller sleepers or those who want extra width.

People who prefer a very plush, cloud-like feel or a very firm, mattress-in-a-box with significant bounce should look elsewhere; side sleepers who need extreme pressure relief or lightweight sleepers who prefer softer top layers may find the medium firm feel too supportive.

Pros & Cons

Pros

• Comfortable, body-contouring gel memory foam provides notable pressure relief for many users.
• Support foam core reduces motion transfer for less partner disturbance at night.
• Arrives in a box for easy delivery and straightforward setup in most bedrooms.
• Fiberglass free with green tea and charcoal additions to help limit initial odor.

Cons

• Firmness is described as medium but receives mixed feedback; some sleepers may find it firmer than expected.
• May not provide enough plush surface for those who prefer an ultra-soft topper or a very pillow-like feel.

Specifications

Brand	Signature Design by Ashley
Size	California King (71 in x 83 in)
Profile	12 in
Comfort level	Medium firm, memory foam contouring
Construction	Gel memory foam top layers with high-density support foam core
Material notes	Fiberglass free; green tea and charcoal gel included

Our Verdict

The Chime 12 in California king is a practical choice for sleepers who want true pressure relief and stable support without a high price tag. It balances contouring gel memory foam with a dense support core, making it good value for couples and back sleepers who need motion isolation and reliable spinal support.

Frequently Asked Questions

How long does it take to expand?
Allow up to 48 hours for the mattress to fully expand after unboxing, though it will be usable within minutes.

Is this mattress suitable for adjustable bases?
Yes, it is compatible with most bed frames and adjustable bases; foundations and power bases are sold separately.

Does it have a strong off-gassing smell?
The mattress includes green tea and charcoal to help control odor; some initial smell is possible but typically dissipates within a few days.