At LA Mattress Store, we offer the best brands at guaranteed low prices. Every mattress comes with our 120-Night Comfort Exchange — if it's not the right fit, exchange it free. Plus, enjoy free white-glove delivery and setup throughout greater Los Angeles and flexible 0% financing up to 48 months.

Diamond Rock Extra Firm 12" Mattress

Proudly designed and made in the USA. It is an innerspring mattress with an extra firm level of support, making it an excellent choice for those who prefer a very sturdy and stable sleep surface.

Key Features and Specifications:

• Performance Moisture Wicking Fabric: The mattress is covered with a performance moisture-wicking fabric that helps regulate temperature and keeps you cool and dry throughout the night.

• Verti-Coil Spring System: The mattress features a Verti-Coil spring system, which provides a sturdy and supportive foundation. The coils are arranged in a pattern that helps distribute weight evenly, reducing pressure points and ensuring proper spinal alignment.

• Extra-Firm-Eco-Flex™ Support Foam: The mattress incorporates an extra-firm Eco-Flex support foam layer, which enhances the overall firmness and support of the mattress, promoting a stable and supportive sleep surface.

• Tri-Zoned Foam Encasement Design: The mattress is designed with a tri-zoned foam encasement, which provides targeted support to different areas of the body and minimizes motion transfer, allowing for undisturbed sleep.

• Traditional Classic Feel: The mattress offers a traditional classic feel, making it a timeless choice for those who appreciate a firmer sleeping experience.

This mattress is recommended for back sleepers and stomach sleepers who enjoy a superior firmer feel. It provides exceptional support and stability, making it suitable for individuals with back pain or those who prefer a very firm sleep surface. Additionally, the mattress is CertiPUR certified, ensuring the use of safe and non-toxic materials.

Experience the support and comfort of the Diamond Rock Extra Firm 12" Mattress, designed to deliver a superior and firm sleeping experience for a restful night's sleep.

LA Mattress Stores provides a variety of sizes to fit any bedroom:

• California King Mattress: 84" wide x 72" long
• King Mattress: 76" wide x 80" long
• Queen Mattress: 60" wide x 80" long
• Full Mattress: 54" wide x 75" long
• Twin XL Mattress: 39" wide x 80" long
• Twin Mattress: 39" wide x 75" long

These sizes ensure comfort for both individuals and couples. Choose from spacious King or Queen sizes or compact Full, Twin XL, or Twin.

LA Mattress Stores also offers sets including mattress and foundation:

• King Mattress Set
• California King Mattress Set
• Queen Mattress Set
• Full Mattress Set
• Twin XL Mattress Set
• Twin Mattress Set

Explore these options to find the perfect fit for your bedroom and enjoy a restful sleep on a LA Mattress Stores Clearance Mattress.

This mattress is backed by the manufacturer's warranty covering defects in materials and workmanship. Warranty terms vary by brand — contact us or visit any LA Mattress Store location for complete warranty details for this specific product. Learn more about warranties.