# Nolah Evolution 15 (Firm) vs Plank Firm Luxe (Extra Firm): Firmness, Price, and Construction Compared

Canonical: https://squishmat.com/compare/nolah-evolution-15-firm-vs-plank-firm-luxe-extra-firm · Data refreshed 2026-10-02 · Source: SquishMat

They're priced closely — the real difference is feel: the Plank Firm Luxe (Extra Firm) is the firmer of the two.

## Full spec table

| Spec | Nolah Evolution 15 (Firm) | Plank Firm Luxe (Extra Firm) |
| --- | --- | --- |
| Type | Hybrid | Hybrid |
| Firmness | 8/10 | 9/10 |
| Height | 15" | 12.25" |
| Queen price | $1,594 | $1,598 |
| Price range (all sizes) | $1,127–$1,781 | $1,065–$1,865 |
| Foam densities (lb/ft³, top → bottom) | 1.6 / 1.8 / 1.5 / 1.5 / 1.5 / 1.5 | 1.5 / 1.8 / 1.8 / 2.5 / 1.5 |
| Coil gauge | 13.5 | — |
| Coil count (queen) | — | — |
| Cooling | 6/10 | 6/10 |
| Motion isolation | 6/10 | 6/10 |
| Edge support | 8/10 | 7/10 |
| Pressure relief | 9/10 | 7/10 |
| Support | 8/10 | 8/10 |
| Natural materials | 4/10 | 2/10 |
| Notable features | 15-inch luxury hybrid build, Nolah AirFoam pressure relief, Zoned HDMax support coils, Reinforced edge support | Extra-firm side of the flippable Plank Luxe, Coil core for durability under heavy loads, Quilted cover directly over the firm support foam, Built for stomach sleepers and very heavy bodies |
| Spec source | NapLab | NapLab |

## Key differences

- The Plank Firm Luxe (Extra Firm) is a step firmer (9/10 vs 8/10), so it suits sleepers who want a bit more pushback.

## Who each mattress is for

**Nolah Evolution 15 (Firm):** The Nolah Evolution 15 (Firm) has a firm feel suited to stomach sleepers and heavier sleepers who need to keep their hips lifted. Strengths: Excellent pressure relief at the shoulders and hips; Strong, even support that keeps the spine aligned; Sturdy edges that make the full surface usable.

**Plank Firm Luxe (Extra Firm):** The Plank Firm Luxe (Extra Firm) has a firm feel suited to stomach sleepers and heavier sleepers who need to keep their hips lifted. Strengths: Strong, even support that keeps the spine aligned.

## FAQ

### Which is firmer, the Nolah Evolution 15 (Firm) or the Plank Firm Luxe (Extra Firm)?

The Plank Firm Luxe (Extra Firm) is firmer at 9/10 versus 8/10 for the Nolah Evolution 15 (Firm).

### Which is cheaper, the Nolah Evolution 15 (Firm) or the Plank Firm Luxe (Extra Firm)?

The Nolah Evolution 15 (Firm) is cheaper in a queen: $1,594 versus $1,598, as of 2026-10-02.

### What is the main construction difference between the Nolah Evolution 15 (Firm) and the Plank Firm Luxe (Extra Firm)?

Both are hybrid builds with similar published specs — the differences come down to feel and price rather than construction. The full layer-by-layer comparison is in the table above.

## More

- [Nolah Evolution 15 (Firm) — full specs](https://squishmat.com/mattresses/nolah-evolution-15-firm)
- [Plank Firm Luxe (Extra Firm) — full specs](https://squishmat.com/mattresses/plank-firm-luxe-extra-firm)
- [Comparison matrix: every mattress we track](https://squishmat.com/compare)

Free to cite with attribution — link to the canonical page. Where a datapoint traces to a third-party teardown, please credit the original measurer too (sources are cited per bed on https://squishmat.com/mattress-database).