Medium-Firm Mattresses

The NM® HD+™ Core Mattress Collection focuses on stability, alignment, and everyday durability. By pairing high‑density support foams with targeted zoning and perimeter reinforcement, these models deliver a balanced feel that stays consistent—night after night.

What defines the HD+™ Core collection

• High‑Density Foam Core
  Robust base foams provide long‑wear support and shape retention for a steady, lifted feel.

• Low Motion Transfer
  All‑foam foundations and tuned transition layers help limit partner disturbance.

• Zoned Lumbar Support
  Center‑third/lumbar zoning or integrated pads add lift under the hips to encourage neutral spinal alignment.

• Edge Support
  High‑density perimeter rails or reinforced borders create a stable sitting edge and more usable sleep surface.

• Comfort Options
  Pressure‑relieving tops (memory‑foam, responsive foam, or quilted comfort) in multiple firmness profiles.

Who it’s for

• Couples who want a quiet, low‑motion bed with strong edges.

• Back & stomach sleepers seeking steady mid‑section support.

• Side sleepers who prefer plush tops over a supportive core.

• Value‑minded shoppers prioritizing durability and alignment.

How to choose (quick tips)

• Firmness by position: Side = medium to medium‑plush; Back = medium; Stomach = medium‑firm to firm.

• Height & feel: 10–14″ builds add transitional layers for smoother pressure relief.

• Temperature: Prefer a cooler feel? Look for open‑cell foams, gel/graphite infusions, and breathable covers.

• Base compatibility: Works with platform/slatted frames and most adjustable bases (confirm model specifics).

• Care: Rotate head‑to‑toe regularly to help maintain an even surface.

What you’ll find here

A curated range of all‑foam (foam‑core) NM® HD+™ mattresses featuring high‑density cores, low motion transfer, zoned lumbar systems, and edge reinforcement—in Twin, Twin XL, Full/Double, Queen, and King.

Features vary by model. Guidance is general and not medical advice.