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
Good time to buy
£349 Double
£349 is a genuine low. Today is the only day in the 91 days we've tracked it's been this cheap.
Checked
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.
Checked
| Sealy Advantage Classic Mattress | Sealy Advantage Quartz Memory Mattress | |
|---|---|---|
| Firmness | Medium | Medium firm |
| Warranty | 5 years | 5 years |
| Mattress type | Not stated | Memory foam |
| Sizes | Size not stated, Single, Small Double, Double, King, Super King | Size not stated, Single, Small Double, Double, King, Super King |
Specs are the figures each retailer publishes. Prices are for the size shown above.