# BONNVIA 7cm Memory Foam Mattress Topper Double with Bamboo Fibre Cover

Source: https://www.ranked10.co.uk/home/best-mattress-topper/bonnvia-7cm-bamboo-memory-foam
Ranked #1 in "Best Mattress Topper 2026: What 10cm Really Means": https://www.ranked10.co.uk/home/best-mattress-topper

- Price: £79.99 (checked on Amazon UK on 2026-09-11)
- Amazon rating: 4.7 from 946 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0D1KD9DR5?tag=ranked10-21

The BONNVIA is the only topper here that tells you what it is made of, how much of it there is and what happens if you do not like it. Seven centimetres of memory foam over high-resilience foam, 8.16kg in the box, a removable bamboo cover, and a 100-night trial with a 10-year warranty. That combination is why it takes first place.

It is also the honest answer to the question this article is about. A 10cm fibre topper and a 7cm foam topper are not the same product at different depths: the fibre one holds air, the foam one holds weight. At 8.16kg the BONNVIA carries more filling than any other topper in this ranking, and that is why it can genuinely change how a firm mattress feels.

## Specification

| Field | Value |
|---|---|
| Stated thickness | 7 cm |
| Item weight as listed | 8.16 kg |
| Price per kg of filling | £9.80 |
| Firmness | Dual-sided, reversible |
| Cover | Bamboo fibre, removable, washable |
| Trial and warranty | 100 nights and 10 years |

## Questions people ask

**How thick is it?**

7cm of memory foam over high-resilience foam — a lower number than the 10cm fibre toppers, but it weighs 8.16kg against their 3.25kg to 3.83kg.

**Is it soft or firm?**

It is dual-sided. One face is softer, the other firmer, and you flip the topper to choose. Buyers describe the firmer side as supportive rather than hard.

**Can I wash it?**

Only the bamboo cover, which is removable and machine washable. The foam core cannot be washed or machine dried.

**Does it raise the mattress?**

By 7cm. On a thick mattress that can make deep fitted sheets tight, so measure before you buy.

**Is there a trial period?**

Yes, 100 nights as stated by the maker, with a 10-year warranty from the date of purchase.

**How many ratings does it have?**

946 at the time of collection, averaging 4.7 stars, with 82 per cent five-star and 2 per cent one-star.