Deal verdict
Too early to call.
We need 30 days of prices for the Sealy Advantage Quartz Memory Mattress before judging the deal.
Mattress Next Day
Not enough history yet
£359 Double · Memory foam
£359 today. We started tracking this on 15 Nov 2026. Its verdict is due in 29 days, once we have 30 days of prices.
The chart appears once we have more than one day of prices. We started tracking this on 15 Nov 2026.
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Dormeo
Usual price
£335 Double · Memory foam
£335 is the usual price. You can safely ignore any countdown timer. It's been £335 or less for 100% of the 154 days we've tracked.
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| Sealy Advantage Quartz Memory Mattress | Dormeo Sereno Foam Mattress | |
|---|---|---|
| Firmness | Medium firm | Medium firm |
| Mattress type | Memory foam | Memory foam |
| Warranty | 5 years | Not stated |
| Sizes | Size not stated, Single, Small Double, Double, King, Super King | Single, Double, King, Super King |
Specs are the figures each retailer publishes. Prices are for the size shown above.