# FORM Core vs Polysleep Luna: Firmness, Price, and Construction Compared

Canonical: https://squishmat.com/compare/form-core-vs-polysleep-luna · Data refreshed 2026-09-04 · Source: SquishMat

These two are close substitutes on paper — the spec table below shows where they differ.

## Full spec table

| Spec | FORM Core | Polysleep Luna |
| --- | --- | --- |
| Type | Foam | Foam |
| Firmness | 6/10 | 6/10 |
| Height | 9" | 12" |
| Queen price | $1,399 | $1,375 |
| Price range (all sizes) | $1,149–$1,899 | $1,045–$1,595 |
| Foam densities (lb/ft³, top → bottom) | 1.7 / 1.6 | 3.0 / 1.8 / 1.8 |
| Coil gauge | — | — |
| Coil count (queen) | — | — |
| Cooling | 6/10 | 5/10 |
| Motion isolation | 7/10 | 7/10 |
| Edge support | 5/10 | 5/10 |
| Pressure relief | 7/10 | 8/10 |
| Support | 6/10 | 6/10 |
| Natural materials | 3/10 | 2/10 |
| Notable features | GelGrid pressure-relief surface, Purple-style gel grid over foam, Medium-firm supportive feel, Launched 2026 by FORM | Antimicrobial foam surface, Ventilated comfort foam, Medium-firm all-foam feel, Canadian-made value |
| Spec source | NapLab | NapLab |

## Key differences

- On the published specs these two are close substitutes — similar firmness, price, and construction. Decide on current price, trial length, and returns policy.

## Who each mattress is for

**FORM Core:** The FORM Core has a medium feel that works for many side and back sleepers, and for combination sleepers who switch positions.

**Polysleep Luna:** The Polysleep Luna has a medium feel that works for many side and back sleepers, and for combination sleepers who switch positions. Strengths: Excellent pressure relief at the shoulders and hips.

## FAQ

### Which is firmer, the FORM Core or the Polysleep Luna?

They rate the same: both are a 6/10 on the firmness scale, a medium feel that works for many side and back sleepers, and for combination sleepers who switch positions.

### Which is cheaper, the FORM Core or the Polysleep Luna?

The Polysleep Luna is cheaper in a queen: $1,375 versus $1,399, as of 2026-09-04.

### What is the main construction difference between the FORM Core and the Polysleep Luna?

Both are foam 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

- [FORM Core — full specs](https://squishmat.com/mattresses/form-core)
- [Polysleep Luna — full specs](https://squishmat.com/mattresses/polysleep-luna)
- [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).