What is the firmest memory foam mattress suitable for back sleepers?

The Plank is a 10 in, flippable all-foam mattress with a firm side and an extra-firm side designed to sleep very flat and supportive. It uses dense support foams and a low-loft quilted top for minimal sink, strong motion isolation, and optional cooling via a GlacioTex cover, making it best for back and stomach sleepers who need very firm support.

The Saatva Classic Luxury Firm is a hybrid, coil-on-coil mattress with a Euro pillow top and zoned lumbar support, offered in 11.5 in and 14.5 in heights. It delivers medium-firm support (6/10), strong edge support, good responsiveness, and cooling performance due to minimal foam and a dual-coil design, suiting sleepers who want supportive, hotel-like feel.

The DreamCloud Classic Hybrid (Firm) is a 12 in, 6-layer hybrid mattress combining a CloudQuilt™ cover, 1 in memory foam comfort layer, supportive foams, and individually-wrapped coils for support and motion isolation. It targets back and stomach sleepers seeking a firmer, supportive surface with cooling cover fibers for temperature regulation.

The Glacier Apex Hybrid is a 14 in hybrid mattress with multiple cooling features (graphite and copper-infused memory foams, ventilated gel foam, and pocketed coils) and a plush, highly contouring comfort profile across seven engineered layers. It targets pressure relief with zoned lumbar support and strong edge support, suited for sleepers who want deep contouring and cooling performance.

The Nectar Premier Copper is a 14 in memory-foam focused mattress with multiple cooling technologies (copper-infused cover, gel-infused memory foam, and phase-change materials) and several comfort layers over a high-density support base. It provides strong pressure relief, deep contouring, and is designed to sleep cooler than standard memory-foam beds. It suits sleepers who want plush contouring with enhanced temperature control.

The Signature Hybrid Firm is a 12.25 in, 7-layer hybrid mattress combining foam comfort layers (including gel swirl memory foam, VX responsive foam, ThermoPhase PCM) over 8 in encased Ascension coils for support and edge stability. It offers strong motion isolation, built-in cooling features, and comes in soft, medium, and firm options to suit many sleepers. It is best for sleepers who want responsive foam feel with coil support and cooling performance.

The Signature Hybrid Firm is a 12.25 in, 7-layer hybrid mattress combining foam comfort layers (including gel swirl memory foam, VX responsive foam, ThermoPhase PCM) over 8 in encased Ascension coils for support and edge stability. It offers strong motion isolation, built-in cooling features, and comes in soft, medium, and firm options to suit many sleepers. It is best for sleepers who want responsive foam feel with coil support and cooling performance.