# slily 12 Inch King Size Mattress for Back Pain, 5FT, 250kg Limit

Source: https://www.ranked10.co.uk/home/best-mattress-for-back-pain/slily-king-back-pain
Ranked #6 in "Best Mattress for Back Pain 2026: Orthopaedic, And Unmeasured": https://www.ranked10.co.uk/home/best-mattress-for-back-pain

- Price: £239.99 (checked on Amazon UK on 2026-09-13)
- Amazon rating: 4.7 from 354 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0F9FHHCJD?tag=ranked10-21

The slily 12 inch king size mattress costs £239.99 and is rated 4.7 stars from 354 ratings, with a 30 centimetre depth and a stated 250 kilogram limit.

It takes sixth because it is the dearest mattress here, the same construction as the double above with all 354 of its ratings shared — and because its dimensions field reads 100 by 30 by 30 centimetres, which is the parcel rather than the bed.

## Specification

| Field | Value |
|---|---|
| Price | £239.99 |
| Shared evidence | 354 ratings, also used by the double |
| Dimensions | 150 x 200 x 30cm, 2 x 1.5 x 0.3m, and 100 x 30 x 30cm |
| Depth | 30 centimetres |
| Cover | Polycotton |
| Layers | 12 |

## Questions people ask

**Which size is it?**

A 5ft king: 150 by 200 centimetres.

**What is 100 by 30 by 30?**

The box it is delivered in.

**Why does it share its ratings?**

Because Amazon pools the reviews of both sizes.

**How thick is it?**

30 centimetres, the thickest here.

**Why is it sixth?**

Because the double is the same mattress for £60 less and its ratings are the same number.

**How many ratings does it have?**

354 at the time of collection, averaging 4.7 stars, with 82 per cent five-star and 3 per cent one-star.