Rank #4 in Best King Size Mattress 2026: 10 Ranked, Four Spec Sheets That Contradict Themselves
NIXNAP 25cm Hybrid King Mattress, 9-Zone Support
- Rating
- 4.6
- Ratings
- 108
- Rank
- #4
Price and rating as shown on Amazon when we collected them. Both change.
The NIXNAP King Mattress is number four in this guide. It is a 5FT hybrid king, 25 cm thick, £127.49, rated 4.6 from 108 ratings, with 86 of the bars in its star breakdown sitting at five stars. Its own measurements are unusually consistent: the King (150x200cm) size, the 2L x 1.5W x 0.25Th metres field, the 200 x 150 x 25 centimetres field and the "10 Inch Hybrid" in the title all describe the same mattress — 10 inches is 25.4 cm, so the metric fields round it down by a few millimetres rather than contradicting it.
Two numbers on the page do not close. The rating is quoted as 108 ratings, but the five bars underneath add to 100 (86 + 4 + 3 + 1 + 6), and the listing does not say where the other eight went. The care field also reads "hand wash only", which is the only washing instruction given for a mattress that the same listing says weighs 29.5 kg. Everything on this page is taken from the NIXNAP listing on Amazon; none of it comes from testing by us.
How those 108 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £127.49 |
|---|---|
| Rating | 4.6 out of 5 from 108 ratings |
| Star breakdown | 86 five-star, 4 four-star, 3 three-star, 1 two-star, 6 one-star — adds to 100, not the 108 stated |
| Size as listed | King (150x200cm) |
| Thickness | 25 centimetres, sold as a "10 Inch Hybrid" |
| Item dimensions (as listed) | 200 x 150 x 25 centimetres; a second field gives 2L x 1.5W x 0.25Th metres |
| Firmness | Medium firm |
| Care instructions (as listed) | Hand wash only |
What it is up against
The rivals it was ranked against in Best King Size Mattress 2026: 10 Ranked, Four Spec Sheets That Contradict Themselves.
Questions people ask
What size is the NIXNAP King Mattress?
The NIXNAP listing gives the size as King (150x200cm) and the dimensions field as 200 x 150 x 25 centimetres, so both describe a 150 cm wide, 200 cm long mattress.
How thick is it?
The title calls it a 10 inch hybrid and the thickness fields say 25 centimetres. Ten inches is 25.4 cm, so the two are a few millimetres apart rather than a contradiction.
Why do the stars not add up to the rating count?
The page shows 4.6 from 108 ratings, but the five bars below add to 100. NIXNAP does not explain the missing eight anywhere in the listing.
How firm is it?
The NIXNAP spec sheet lists the firmness as medium firm, and the bullet points describe it as a medium firm king mattress.
How soon can I sleep on it?
The listing says the vacuum-packed mattress should be allowed at least 72 hours to fully expand before use, though it also offers a 100-night trial.
Can I wash the cover?
The only care instruction the NIXNAP listing gives is "hand wash only"; the cover material is listed as polyester.
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