Do memory foam mattresses have coils?

An all-foam bed’s support core is almost always firmer, denser polyfoam, and its comfort system may include memory foam.

Original Mattress recommends looking for a core with a minimum density of 2 lb/ft³.

Dense foam cores can provide firm support, while lower-density foam can be used in upholstery layers.

National Mattress says to check its construction and materials section to confirm whether its mattress has an all-foam core.

Bear’s Original Hybrid pairs foam comfort layers with a coil support core.

• Most hybrids use pocketed coils wrapped in fabric.
• Bear’s Original Hybrid lists foam comfort layers and a coil support core.
• The Dosaze DreamAlign Hybrid specification lists memory foam layers and a separate tri-zone coil layer.
• Saatva describes a thinner, more flexible layer of individually wrapped comfort coils above the support core.
• Innerspring mattresses may have a single base coil layer covered with foam, fabric, or other padding.

Tom’s Guide’s Leesa Original review describes a 3-layer foam build and a memory-foam-like feel without calling it an actual memory foam mattress.

• All-foam mattresses use foam, latex, or fabric layers and have no coils.
• Traditional innerspring designs may contain Bonnell or continuous-wire coils.
• Most hybrids use pocketed coils wrapped in fabric.
• Bear’s Original Hybrid is described as having foam comfort layers and a coil support core.

Coils flex with pressure and movement, providing firmer support as pressure increases.

• Check the coil type, gauge, count, and overall design when comparing support.
• GoodBed says connected coils generally provide more bounce and easier repositioning than pocketed springs.
• Connections between coils can transfer motion across the bed and create a roll-together effect.

Microcoils can appear in comfort or transition layers, and some mattresses use them with a core other than a coil core.

• Microcoils are 1 to 4 inches tall, compared with 6 to 8 inches for standard coils.
• Tom’s Guide says flexible microcoils can add pressure relief, airflow, and mild resistance.
• Saatva describes a thinner, more flexible layer of individually wrapped comfort coils above the support core.

Pocketed coils can move independently, while interconnected Bonnell coils move as a single unit.

• Pocketed coil sleeves are sewn or glued together around each spring.
• Bonnell coils are interconnected and move as a single unit.
• Coil type alone does not determine comfort, firmness, cooling, motion isolation, or durability, so look beyond coil style when comparing a mattress.

Coil connections can affect movement, and friction from coils may produce noise.

• Coils may make noise through friction, and connected coils can transfer movement.
• Continuous-wire coils remain tightly connected and may still transmit some movement.
• GoodBed notes that connected coils can transfer motion across the bed and create a roll-together effect.

In Bear’s hybrid, the listing identifies the coil support core separately from foam comfort layers; microcoils may also appear in comfort or transition layers.

1. A support core is usually the thickest part and commonly measures 6 to 10 inches.
2. Bear’s hybrid lists its foam comfort layers separately from its coil support core.
3. The Dosaze DreamAlign Hybrid specification lists memory foam, support foam, and a separate tri-zone coil layer.
4. Some makers provide construction and materials details or a layer-by-layer view that shows where coils appear.

Bear lists a coil support core for its Original Hybrid; National Mattress says its construction and materials section can confirm an all-foam core.

Memory foam mattresses describe all-foam beds in which memory foam is a primary comfort-system material.

Polyurethane foam can be used in upholstery layers or, when high-density, as a core material.

Dosaze lists memory foam layers, support foam, and a separate tri-zone coil layer in one specification.

Tom’s Guide’s Leesa Original review says it is not actually a memory foam mattress.

Are mattress coils and springs the same thing?

Yes. Tom’s Guide treats coils and springs as equivalent terms for the support base of an innerspring or hybrid mattress.

Can a memory foam mattress have pocketed coils?

Strictly defined, a memory foam mattress has no coils; the Dosaze DreamAlign Hybrid specification lists memory foam layers and a separate coil layer, but does not say whether those coils are pocketed.

Pocketed coils have individual fabric sleeves that are sewn or glued together.

Does every hybrid mattress use memory foam?

No. Comfort systems may include memory foam, polyfoam, latex, or other fabrics.

Can I feel coils through the foam layers?

You may feel coils more when the comfort and transition layers are relatively thin.

Are memory foam mattresses always all foam?

By the strict definition, memory foam mattresses are all-foam beds with memory foam as a primary comfort-system material.

National Mattress describes its all-foam design as using foam for support and comfort without a metal coil support system.

Tom’s Guide says the Leesa Original is not an actual memory foam mattress.

We read 14 published pages from 11 sites (Sleep Foundation, dosaze.com, help.nationalmattress.ca, help.avocadogreenmattress.com and 7 more), checked in October 2026. Every sentence in the answers above cites one of them; the offer card at the end names its own source. This page reports published sources only; we did not test mattresses in person.