Signature Design by Ashley 12 Inch Hybrid King Mattress in a Box Review
A Signature Design by Ashley 12 inch hybrid king mattress combining CertiPUR-US certified gel memory foam with 360 individually wrapped coils, shipped compressed in a box.
| Brand | Signature Design by Ashley |
|---|---|
| Color | White |
| Size | King |
| Height | 12 inches |
| Width | 76 inches |
| Depth | 79.5 inches |
| Best for | Buyers wanting a medium firm king hybrid mattress with reduced motion transfer |
Product Overview
Ashley builds this mattress around a hybrid construction, layering foam comfort on top of individually wrapped innerspring coils rather than relying on foam or springs alone, aimed at supportive, restful sleep.
The 2 perimeter rows of coils are designed to improve edge support, while the individually wrapped coil design is intended to reduce motion transfer across the mattress.
Score Breakdown
This verdict is based on the manufacturer's stated specifications, the current Amazon listing and its product images, the confirmed materials and design, real buyer ratings, and our research into the product category. Scores are consistent editorial judgments, not laboratory measurements, and we did not receive a paid sample.
Key Features
Gel memory foam layered over individually wrapped coils.
Certified gel memory foam comfort layer.
Individually wrapped for reduced motion transfer.
Improves edge support around the mattress.
Balanced feel from layered foam and coil support.
Expands within 48 hours after unboxing.
Design and Build Quality
The mattress measures 76 inches wide by 79.5 inches deep by 12 inches tall, with a recorded weight of about 94 pounds, model M69741, finished in white. Ashley layers .75 inches of high density gel memory foam, 1 inch of upholstery grade support foam and 1.5 inches of soft quilt foam over 360 individually wrapped coils.
The gel memory foam is CertiPUR-US certified, and Ashley states the quilt foam adds the soft, cozy comfort layer on top of the firmer support structure beneath it.
Performance in Everyday Use
Ashley rates this mattress as medium firm, built around the combination of gel memory foam for comfort and wrapped coils for lumbar support and edge stability, aimed at a balanced feel rather than an extremely soft or extremely firm sleep surface.
Because the mattress ships compressed in a box, Ashley instructs unboxing it, cutting the protective wrap and letting it unroll and expand, with up to 48 hours needed for the mattress to reach its full size. The mattress is compatible with most king bed frames, though a bed foundation, box spring or frame is sold separately.
How It Performs: The Evidence
| Decision factor | What we found | Evidence and measurement | Score | Why it matters |
|---|---|---|---|---|
| Construction | Hybrid, foam over wrapped coils | Feature bullet states layers of padding atop individually power packed innerspring coils with 2 perimeter rows | 8.4 | Confirms the hybrid construction behind the support claim |
| Foam layers | .75in gel foam, 1in support foam, 1.5in quilt foam | Feature bullet states includes a .75 inch high density gel memory foam, 1 inch upholstery grade support foam and 1.5 inch soft quilt foam | 8.3 | Confirms the exact foam layering in this mattress |
| Coil count | 360 individually wrapped coils | Feature bullet states 360 individual power packed wrapped coils for maximum lumbar support | 8.2 | Confirms the coil count behind the motion isolation and support claim |
| Dimensions | 76 x 79.5 x 12 inches | Feature bullet states measures 76 inches W x 79.5 inches D x 12 inches H | 8.0 | Confirms the exact mattress dimensions |
| Expansion time | Up to 48 hours | Feature bullet states please allow 48 hours for your mattress to fully expand | 7.7 | Confirms how long the mattress needs to reach full size |
| Weight | About 94 pounds | Item dimensions list weight at 94 pounds | 7.8 | Confirms the recorded mattress weight |
Who Should Buy It
- Buyers wanting a medium firm hybrid mattress
- King size bed frames
- Reducing motion transfer between sleeping partners
- Buyers wanting CertiPUR-US certified foam
- Edge support for sitting or sleeping near the mattress perimeter
- Buyers comfortable with a mattress in a box setup
- Anyone wanting a soft or extra firm mattress rather than a medium firm hybrid
- Needs up to 48 hours to fully expand after unboxing
- Bed foundation, box spring and frame are sold separately
- At about 94 pounds, it is heavy to move or reposition without help
- Only medium firm comfort is offered in this specific listing
Full Specifications
How It Compares
| Feature | Signature Design by As | Typical option | Higher-tier option |
|---|---|---|---|
| Construction | Hybrid, foam over wrapped coils | All foam mattress | Traditional innerspring, no foam layer |
| Certification | CertiPUR-US certified foam | No stated certification | CertiPUR-US certified foam |
| Motion transfer | Individually wrapped coils | Connected coil system | Individually wrapped coils, different count |
| Edge support | 2 perimeter coil rows | No reinforced perimeter | 2 perimeter coil rows |
| Firmness | Medium firm | Soft comfort only | Firm support only |
| Shipping | Compressed in a box | Delivered fully expanded | Compressed in a box, different size |
Alternatives Worth a Look
This is a Signature Design by Ashley 12 inch hybrid king mattress with CertiPUR-US certified gel memory foam over 360 individually wrapped coils, rated medium firm. It suits buyers wanting a supportive hybrid mattress with reduced motion transfer, with the main consideration being the up to 48 hour expansion time after unboxing.
Frequently Asked Questions
Is this a hybrid mattress?
Yes, gel memory foam layered over individually wrapped coils, per the listing.
How many coils does this mattress have?
360, individually wrapped, per the listing.
How firm is this mattress?
Medium firm, per the listing.
How long does it take to expand after unboxing?
Up to 48 hours, per the listing.
What size is this mattress?
King, measuring 76 by 79.5 by 12 inches, per the listing.
Does this come with a bed frame?
No, the listing states a bed foundation, box spring and frame are sold separately.
Is the foam certified safe?
Yes, CertiPUR-US certified, per the listing.
This review is based on Ashley's stated materials, coil count, foam layering and dimensions for this mattress as listed. It is editorial analysis of the features as described, not independent firmness or motion transfer testing of this specific mattress.