# Plank Firm (Extra Firm) vs Sleep EZ Select Sleep Organic (Extra Firm): Firmness, Price, and Construction Compared

Canonical: https://squishmat.com/compare/plank-firm-extra-firm-vs-sleep-ez-select-sleep-organic-extra-firm · Data refreshed 2026-10-02 · Source: SquishMat

The Sleep EZ Select Sleep Organic (Extra Firm) is $133 cheaper in a queen; the table below shows what the price gap buys.

## Full spec table

| Spec | Plank Firm (Extra Firm) | Sleep EZ Select Sleep Organic (Extra Firm) |
| --- | --- | --- |
| Type | Foam | Foam |
| Firmness | 9/10 | 9/10 |
| Height | 10.5" | 10" |
| Queen price | $1,332 | $1,199 |
| Price range (all sizes) | $749–$1,532 | $1,199 |
| Foam densities (lb/ft³, top → bottom) | 1.5 / 1.8 / 2.5 / 1.5 | 4.5 / 4.5 / 4.5 |
| Coil gauge | — | — |
| Coil count (queen) | — | — |
| Cooling | 5/10 | 7/10 |
| Motion isolation | 7/10 | 6/10 |
| Edge support | 5/10 | 6/10 |
| Pressure relief | 8/10 | 8/10 |
| Support | 6/10 | 8/10 |
| Natural materials | 2/10 | 9/10 |
| Notable features | Extra-firm side of the flippable Plank, Firmest widely sold consumer sleep surface, Quilted cover directly over the high-density support core, Built for stomach sleepers and very heavy bodies | All three layers in extra-firm organic Dunlop latex, Firmest configuration Sleep EZ builds, No polyurethane foam anywhere in the build, Layers restackable at home if it reads too firm |
| Spec source | NapLab | NapLab |

## Key differences

- The Sleep EZ Select Sleep Organic (Extra Firm) is $133 cheaper in a queen ($1,199 vs $1,332 as of 2026-10-02) than the Plank Firm (Extra Firm).
- The Sleep EZ Select Sleep Organic (Extra Firm) uses denser foam (lowest layer 4.5 vs 1.5 lb/ft³) — density is the best single predictor of how long foam lasts before it sags.
- The Sleep EZ Select Sleep Organic (Extra Firm) scores notably better for sleeping cool (7/10 vs 5/10).

## Who each mattress is for

**Plank Firm (Extra Firm):** The Plank Firm (Extra 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.

**Sleep EZ Select Sleep Organic (Extra Firm):** The Sleep EZ Select Sleep Organic (Extra 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; Built largely from natural materials like latex, wool, or cotton.

## FAQ

### Which is firmer, the Plank Firm (Extra Firm) or the Sleep EZ Select Sleep Organic (Extra Firm)?

They rate the same: both are a 9/10 on the firmness scale, a firm feel suited to stomach sleepers and heavier sleepers who need to keep their hips lifted.

### Which is cheaper, the Plank Firm (Extra Firm) or the Sleep EZ Select Sleep Organic (Extra Firm)?

The Sleep EZ Select Sleep Organic (Extra Firm) is cheaper in a queen: $1,199 versus $1,332, as of 2026-10-02.

### What is the main construction difference between the Plank Firm (Extra Firm) and the Sleep EZ Select Sleep Organic (Extra Firm)?

Both are foam builds, but the Sleep EZ Select Sleep Organic (Extra Firm) uses meaningfully denser foam, which generally predicts better durability. Full per-layer densities are in the table above.

## More

- [Plank Firm (Extra Firm) — full specs](https://squishmat.com/mattresses/plank-firm-extra-firm)
- [Sleep EZ Select Sleep Organic (Extra Firm) — full specs](https://squishmat.com/mattresses/sleep-ez-select-sleep-organic-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).