Serta Perfect Sleeper Cascade Range 14" Extra Firm Mattress

Serta Perfect Sleeper® Cascade Range 2026 Collection Innerspring

Maximum Support and Lift, with Memory Foam at the Surface

The Serta Perfect Sleeper® Cascade Range Extra Firm Mattress is the firmest feel in the 2026 Perfect Sleeper® lineup. The 14" profile is built on higher-density 920 Q4™ linked coils and 5 Zoned Comfort, topped with QuiltLoft™ Memory Foam and a CoolFeel® Plus cover with breathable wool.

Feel Extra Firm

Profile 14"

Support 920-Density Q4™ Coils

Best For Back & stomach sleepers

Comfort Level This mattress: Extra Firm

Extra Firm

Firm

Medium

Plush

Ultra Plush

How It Feels Extra Firm Comfort, Explained

Extra Firm is structured and strong with minimal give, so your body stays on top of the mattress instead of sinking in. That lift helps keep the hips from dipping below the shoulders, a common cause of morning back stiffness for stomach and back sleepers. A quilted memory foam layer takes the edge off the surface so firm never feels hard.

Ideal for: Back and stomach sleepers who want maximum support

What's Inside the Cascade Range Extra Firm

Layer diagram for this exact model.

Construction · Bottom to Top

1 Q4™ Support System

920-density 4-in-1 coils are linked together to spread your weight evenly and deliver long-lasting support, surrounded by BestEdge® Foam Encasement for stability.

2 5 Zoned Comfort

Alternating firm and plush zones are designed to hug the curves of your shoulders, back and hips, adding support where the body naturally curves.

3 QuiltLoft™ Memory Foam