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Comfort trial

Comfort fillings
Firmness rating

Support system
Let the resilient comfort of natural latex cradle you into ultimate pressure relieving sleep. Built to last and designed to fit any sleeper.

An innovative spring design from the specialists at Sealy that uses unique shapes and varied tension to provide excellent full-body support and pressure relief.

A plush, adaptive material that responds to your body shape for individualised, ideal comfort. Latex actively responds to your body throughout the night for a truly revitalising slumber.

Offering a soothing night's rest by evenly distributing your body weight across the mattress. The pressure point relief provides the ultimate relaxation needed for a deep slumber.

Durable edge-to-edge support provides a maximised sleeping surface for a more secure sleep. Sit and lay comfortably right to the very edge with zero 'roll-off' sensation.

A sumptuously soft finish that provides additional cosiness and warmth. Knitted covers enhance airflow and are incredibly breathable. So, you can enjoy a cooler snooze.
Firmer than a medium mattress for extra support

About 11.4 inches deep. Depth is an important factor when buying a mattress as it can affect the suitability for particular bedding, mattress toppers and bed frames.

With a single-sided mattress, there's no need to flip. Simply rotate every few months to care for your mattress. Fuss free mattress maintenance!

Stitched into the mattress border, turning handles are there for easier moving and turning. When caring for your mattress, simply use the handles provided for ease of use.

For your peace of mind

Expertly handcrafted in the UK. This product helps to support our economy and helps to reduce environmental impact.

This product conforms to BS7177: 2008, for use at home

For the highest standards of quality and safety
Experience resilient comfort with the Waltham Latex Advantage Mattress from Sealy. Drift off to sleep feeling perfectly supported every single night.
Latex comfort
What really makes the Waltham stand out from the crowd is the top comfort layer of natural latex. One of nature's most durable materials, latex moulds to the shape of your body and will instantly bounce back to its original shape, every time.
It's that ability to hold its form that gives you unrivalled pressure relief. The organic material of latex is naturally anti-allergenic and inherently cooling. Built to outlast any other type of mattress filling you have had before.
Reactive relief
When you combine latex with Sealy's PostureTech Core Support spring system, the results are a super comfy medium support surface. The scientifically developed spring system reacts to the heaviest parts of your body. Each spring becomes firmer under pressure. This gives you that extra pressure-relieving lift, no matter what kind of sleeper you may be.
Sitting pretty
Relax and stretch out right to the edge of your new mattress. With innovative Edge Guard technology, you won't experience that dip or sag when sitting or sleeping on the edge of your mattress.
Deep and snuggly
The plush quilted sleep surface adds the final touch of comfort to the Waltham Advantage. Luxuriously finished in a modern knit fabric design. This mattress not only looks great but will stay fresher for longer.
Handy handles
This mattress is single-sided, so you will never need to flip it over. Simply use the four built-in turning handles to rotate top to toe to ensure maximum comfort and longevity.
Zero landfill
Put your mind to rest. All Sealy Advantage mattresses are 100% recyclable at the end of their use, with no parts ever going to landfill. You can buy in confidence knowing that your mattress is not harming the planet, but you also have a 5 Year Guarantee!
Weights: Single: 19kg, Small Double: 25kg, Double: 28kg, King Size: 32kg, Superking: 38kg, Superking Zip and Link: 40kg
This mattress comes with a free 60-night comfort trial - like all of our mattresses!
The trial allows you to test your mattress for 60 nights, and if you don't like it, you can swap it!
It can take some time to get used to a new mattress, which is why we ask you to sleep on your mattress for 30 nights. If you don't like the feel of your mattress after 30 nights, simply get in touch! We'll be happy to swap it for you.
| Firmness | Medium to firm |
| Comfort fillings | Latex |
| Support system | PostureTech Core Support Springs |
| Edge support | Yes |
| Cover | Knitted cover |
| Pressure relief | Yes |
| Turning handles | Yes |
| Single-sided | Yes |
| Guarantee | 5 years |
| Awards & accreditations | Handcrafted in the UK, Approved by the National Bed Federation |
| Fire resistance | Conforms to BS7177: 2008, for use at home |
| Downloads | Sealy Product Care and Guarantee |
| Size | Width | Length | Depth |
|---|---|---|---|
| Single | 90cm | 190cm | 29cm |
| Small Double | 120cm | 190cm | 29cm |
| Double | 135cm | 190cm | 29cm |
| King Size | 150cm | 200cm | 29cm |
| Superking | 180cm | 200cm | 29cm |
| Superking Zip and Link | 180cm | 200cm | 29cm |
Please allow for a tolerance of +/- 2cm
The following delivery methods apply to mainland England and most of Scotland, Wales and Northern Ireland. Please read our delivery page for more information.
Next day delivery (weekdays only) Order before | FREE |
Weekday of your choice Order up to 60 days ahead | FREE |
Weekend On Saturday or Sunday of your choice | £17.50 |
Delivery to the front door of your building Free upgrade for Small Double, Double, King Size, Superking and Superking Zip and Link to your room of choice | Yes |
Two-hour delivery time slot We’ll let you know on the day before your delivery | Yes |
Call to let you know we’re on our way On your delivery day | Yes |
Delivery to your room of choice Free upgrade for Small Double, Double, King Size, Superking and Superking Zip and Link | £20.00 |
Mattress recycling We'll take away your old mattress | £35.00 |
Delivery is on an all-day service, 7am - 8pm for mainland England and most of Scotland, Wales and Northern Ireland.
Need further information? Please visit our Delivery page.
A balanced snapshot of what customers love (and what they don't), generated by AI.
The mattress was rated as medium firm, although it is fairly comfortable it’s far softer than I was expecting, wish I had purchased a firm memory foam mattress instead, that would have been much firmer and less cost.
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Reply from MattressOnline.co.uk, 3 days ago
Hi Paul I am sorry you are not finding your mattress comfortable - we appreciate the feedback. The mattress you have purchased does come with a 60-night Comfort Trial; if you are not finding it comfortable you would be more than welcome to exchange this for something more suitable. If you would like to make contact with our Customer Service team on 01709 780881 or customerservice@mattressonline.co.uk, we can discuss the options with you. Kind regards Charlie
Very happy with mattress. Decided to opt for firm to medium due to neck and shoulder pain and this has certainly improved (previously had Extra firm).
Verified Purchase
Very pleased either way mattress
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Love the feel of the latex. Sealy is a good quality trusted mattress. Excellent service. Great price.
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Best mattress comfortable and supportive
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Website easy to navigate, ordering and payment straight forward. Next day delivery on time with polite crew.
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The best sleep for a long time, Thankyou
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Support and comfort are equal to the price
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Fantastic mattress we now have 3 all together so must be good . Very comfortable and support is as stated
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Couldn't give anything less
Verified Purchase
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Sunday: Closed
customerservice@mattressonline.co.uk