Eastman House
Eastman House BIA Universal Flat Box Spring Foundation
1 review
$259Queen
Free Local White-Glove Setup & Haul-Away on Orders Over $499Announcement 1 of 2
Explore Payment Options — View Financing DetailsAnnouncement 2 of 2
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Rockwell Extra Firm combines an extra-firm feel, titanium and charcoal memory foams, and wrapped coils in a substantial 16-inch profile. It is a distinctly firm option for shoppers who prefer less give at the surface.
A substantial hybrid with an extra-firm feel.
The complete mattress height to include in your bed setup.
Two high-density comfort materials above the extra-firm spring system.
The spring support system beneath the comfort materials.
The main comfort and support materials in this mattress.
Order before 4pm. Delivery options and charges are shown at checkout. We'll call after purchase to confirm your delivery date.
Delivery details120 nights to be sure. One exchange for any mattress we stock, flat $100 swap fee. Check the full terms for eligibility and clearance exclusions.
Read the full termsThe Black Diamond Rockwell Luxury Extra Firm Mattress for Heavy Sleepers, 16" combines an extra-firm feel, titanium and charcoal memory foams, and wrapped coils in a substantial 16-inch profile. It is a distinctly firm option for shoppers who prefer less give at the surface.
If softer mattresses have felt too yielding, Rockwell offers another feel to try. Compare comfort at your shoulders and hips as well as the support underneath. For a heavier sleeper, also confirm the weight capacity of the complete bed setup; the mattress height and comfort label are not a weight rating.
Extra firm and 16 inches describe two different things: the comfort feel and the total height. Neither tells you the weight limit of your bed frame or foundation.
At 16 inches, Rockwell already contributes considerable bed height. A suitable low-profile foundation may help you reach a comfortable sitting height. Use our bed-height comparison to plan the mattress and foundation together. For an adjustable setup, confirm the exact mattress-and-base pairing before ordering.
Use the size selector for current options, pricing and availability. Check Los Angeles delivery and setup options, or contact an LA Mattress showroom for help comparing Rockwell Extra Firm with other feels. Compare more extra-firm mattresses if you are still building your shortlist.
Compare Queen-size options side by side. The differences that matter, in one table.
Swipe to compare all three mattresses →
| Queen | DiamondBlack Diamond Rockwell Luxury Extra Firm Mattress - 16" | Tempur-PedicTEMPUR-ProAdapt® Medium Hybrid Mattress - 12" | Stearns & FosterEstate® Firm Innerspring Mattress - 14.5" |
|---|---|---|---|
| Price (Queen) | $2,599 · was | $3,399 | $2,399 |
| Feel | Extra Firm | Medium | Firm |
| Best for | Shoppers specifically seeking an extra-firm hybrid | Most sleepers, thanks to the universal medium feel | Back and stomach sleepers |
| Cooling / cover | See product details | SmartClimate knit cover | See product details |
| Height | 16″ | 12″ | 14.5″ |
| Warranty | 20 years | 10 years | 10 years |
| Try in store | Check showroom availability | Check showroom availability | Check showroom availability |
| Shop Queen |
Pillows and sheets to complete your setup. Each item is optional and added only when you choose it.Bedding for Queen. Pillow sizes are shown separately.
Diamond Mattress is a 4th-generation family-owned company that has been handcrafting mattresses in Southern California since 1946. Founded by the Pennington family in Compton, California (now headquartered in Rancho Dominguez), Diamond is one of the few mattress manufacturers in America that is fully vertically integrated. They make their own pocketed coils, process their own memory foams, and cut and sew their own fabrics, all under one roof. This level of control over every component means Diamond can maintain strict quality standards that outsourced manufacturers cannot match. Every Diamond mattress is CertiPUR-US certified, GREENGUARD Gold certified for low chemical emissions, OEKO-TEX tested for harmful substances, and ECO INSTITUT certified for environmental safety. Diamond also uses REPREVE recycled fibers in select products, demonstrating their commitment to sustainable manufacturing practices.
Explore DiamondGet to know your mattress, from comfort and construction to delivery and care.
It has a extra firm feel, 10 out of 10 on our scale where 1 is the softest. It is a a weaker fit for side sleeping, great fit for back sleeping, and great fit for stomach sleeping.
From top to bottom it is built from Titanium and charcoal memory foams, Coolstream fabric and Ice Flex bands, 9-Series wrapped coils, and Foam-encased perimeter in a 16-inch profile. Two high-density comfort materials above the extra-firm spring system.
It suits: Shoppers specifically seeking an extra-firm hybrid; Beds where the 16-inch profile suits the planned height; Sleepers comparing cushioning with spring support. It is a weaker fit for: Shoppers who want a deeply plush surface; Sleepers who prefer more surface give.
Yes, free white-glove delivery anywhere in Los Angeles on orders over $499, including setup and free haul-away of your old mattress. Order by 4pm for same-day delivery.
You have our 120-night comfort exchange. Sleep on it for at least 30 nights, and if it isn't right, exchange it for another mattress, we handle the pickup and redelivery.
It's covered by a 20-year manufacturer warranty against defects, and we file warranty claims on your behalf.
Yes, 0% APR financing through Synchrony on approved credit, plus Acima lease-to-own with no credit needed. Most applicants are approved in minutes at checkout or in any showroom.
Display models and sizes vary by location. Contact your preferred showroom before visiting to confirm the exact model is available to try. Display availability does not confirm purchase stock or delivery timing. Find contact details at showroom locations.
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