Sleep Well For Less - Last Chance
A king size mattress topper measures 150 x 200cm - sized to cover a standard king size mattress exactly. It sits on top of the mattress to adjust the feel of the sleeping surface: adding softness, pressure relief, or temperature management without replacing the mattress itself. Our king size topper range covers memory foam, wool, latex, and foam options across soft, medium, and firm tensions, from practical everyday choices through to premium natural options from Vispring and Hypnos, with warranties from 2 to 10 years. Free delivery on orders over £100 and expert advice seven days a week.
Browse the full king size mattress topper range below, or speak to our team for a personal recommendation. We are available seven days a week on 01928 242829.
A king size bed is typically a main bedroom investment - and the topper range available at this size reflects that. The king size range runs from well-specified memory foam options with long guarantees through to premium natural wool and latex toppers from Vispring and Hypnos, which represent a meaningful step up in both material quality and price.
The decision process is the same regardless of size: match the fill type to your primary sleep priority and the tension to your weight and sleep position. But at king size it is worth knowing that the premium end of the range - natural wool toppers and latex options - exists and is worth considering if you are investing in a quality king size mattress that deserves a topper to match.
For most couples on a king size bed, the shared-bed considerations covered in our double topper guide apply here too: motion isolation matters if one partner is restless, and temperature management matters if one or both of you sleep warm. Wool is the best natural temperature regulator across a wide range of conditions. Memory foam with open-cell or spring-cell technology provides the strongest motion isolation. For a full guide to choosing between fill types, see: How to Choose the Right Mattress Topper for Your Bed.
| Factor | Why It Matters | What to Check |
|---|---|---|
| Fill type | Determines pressure relief, temperature regulation, motion absorption, and durability. For a king size main bedroom bed, this decision is worth making carefully - the right fill makes a lasting difference. | Match the fill to your sleep priorities. If you and your partner have significantly different needs, two single toppers side by side is a practical alternative to one king size option. |
| Tension | Determines how much resistance the topper provides. Soft suits lighter sleepers wanting cushioning. Medium suits most everyday use. Firm suits heavier sleepers or those who prefer less surface give. | Consider both sleepers' weights and sleep positions if the bed is shared. Medium is the most practical compromise for most couples. |
| Warranty length | The warranty is a useful indicator of expected durability. Toppers used nightly on a main bedroom king size bed need to hold their performance for years. | Check the warranty length and terms on the individual product listing. A longer warranty at this price point is worth prioritising. |
Not sure which is right? Speak to our team on 01928 242829.
| Size | Dimensions | Notes |
|---|---|---|
| King Size | 150 x 200cm | Must match the mattress exactly. Always confirm the topper dimensions on the individual listing. |
If you use a deep mattress or plan to add the topper to a mattress with a topper already in place, check that your fitted sheet will still cover the combined depth. A deep-fit fitted sheet may be needed. Browse our deep fitted sheets for suitable options.
| Fill Type | How It Performs | Best For |
|---|---|---|
| Memory foam | Contours to body shape, absorbs movement, provides pressure relief at shoulders and hips. Warmer than other fills unless open-cell or spring-cell construction. Award-winning options available. | Couples where motion isolation matters, those wanting pressure relief, those wanting to soften a firm king size mattress. The most widely chosen fill in this range. |
| Foam (advanced cell technology) | Spring-cell or open-cell foam that provides similar pressure relief to standard memory foam with significantly better airflow. More responsive feel than standard foam. | Hot sleepers who want memory foam properties without the heat retention, those wanting a more reactive sleeping surface |
| Wool | Naturally temperature-regulating and moisture-wicking. Breathes well in both warm and cool conditions. Hypoallergenic. The premium natural option in this range. | Those wanting a natural material that performs across all seasons, couples with different temperature preferences, those pairing with a premium natural fibre mattress |
| Latex | Responsive and springy rather than slow-sinking. Naturally hypoallergenic and antimicrobial. Highly durable. The premium performance option in this range. | Allergy sufferers, those wanting a long-lasting premium option, those who prefer a more responsive surface feel than foam |
The king size range includes options from Vispring and Hypnos at a significantly higher price point than the foam and memory foam options. These are worth understanding as a distinct category.
| What Makes Them Different | Detail |
|---|---|
| Natural materials | Vispring wool toppers use natural fibres sourced and processed to the same standards as their mattress range. Hypnos latex toppers use natural latex. These are genuinely different materials from synthetic alternatives - not a marketing distinction. |
| Construction quality | Both brands apply the same construction standards to their toppers as to their mattresses. The stitching, ticking, and edge finish reflect this. |
| Longevity | Natural fibre and latex toppers at this specification typically outlast synthetic options. A 5-year guarantee on premium options at this level is a genuine long-term commitment. |
| Best paired with | A Vispring or Hypnos mattress, or any premium natural fibre mattress where you want the comfort layer to match the quality of the spring unit beneath it. |
These are not the right choice for everyone - but if you have invested significantly in a king size mattress, they are worth serious consideration.
| Warranty | What It Indicates |
|---|---|
| 2 years | Reliable entry-level specification for everyday main bedroom use |
| 5 years | Mid to premium range. Found on advanced foam and natural fibre options. Reflects confidence in long-term performance. |
| 8 years | Premium foam technology. Designed for nightly use and consistent performance over many years. |
| 10 years | Top of range memory foam. The longest warranty available in this range. |
Always check the individual product listing for full warranty terms and conditions.
The order in which bedding layers are applied affects both comfort and protection.
| Layer | Product | Purpose |
|---|---|---|
| 1 - Mattress | Your king size mattress | The foundation |
| 2 - Mattress protector | Fitted directly over the mattress | Protects the mattress from moisture and allergens. Goes under the topper. |
| 3 - Mattress topper | On top of the protector | Adjusts the surface feel |
| 4 - Fitted sheet | Covers both topper and protector | The sleeping surface |
A common mistake is placing the topper under the protector. This means the protector is not protecting the topper, and the topper cannot be changed or cleaned independently of the protector. Always put the protector directly on the mattress, then the topper on top of the protector.
| Item | Included? |
|---|---|
| Mattress topper | Yes - always |
| Removable washable cover | On most models - check individual listing |
| Care guide | Yes - always included |
| Warranty | Yes - 2 to 10 years depending on brand and model. Check individual listing. |
| Mattress protector | No - sold separately. Recommended to protect the topper. See our king size mattress protectors. |
Always check the individual product listing for full details before purchasing.
| What We Offer | Why It Matters to You |
|---|---|
| 50+ years of expertise | Honest advice on fill type, tension, and whether the premium natural options are worth it for your specific mattress and priorities |
| Memory foam, wool, latex, and foam options | A range from practical award-winning everyday options through to premium natural Vispring and Hypnos toppers |
| Warranties from 2 to 10 years | Covering practical everyday use through to long-term premium investment |
| Award-winning options in the range | Good Housekeeping recognised models available |
| Free UK delivery on orders over £100 | No hidden delivery charges on the vast majority of orders. Some remote postcodes may incur a surcharge - see our delivery page for details. |
| Price Promise Guarantee | We'll match any like-for-like price you find elsewhere |
| Interest-free finance available | Spread the cost on eligible orders - see our finance page for terms |
| Expert advice, 7 days a week | Real people via phone, chat, or in-store - no scripts, no pressure |
| Rated Excellent on Trustpilot | Real feedback from verified customers across thousands of orders |
Not sure whether a memory foam, wool, or latex topper suits your king size bed and sleep priorities? Our team can help you work through it. Chat online, call us, or visit our showrooms in Cheshire and Greater Manchester. We're open seven days a week.
| How to Reach Us | What to Expect |
|---|---|
| Live chat | Fast responses for quick questions. Available during opening hours. |
| Phone - 01928 242829 | Speak directly with a sleep expert. Best for advice on fill type, tension, and whether the premium tier is right for your mattress. |
| In-store (Cheshire / Greater Manchester) | See topper options in person. See our store locations. |
| Help Centre | Buying guides and FAQs available 24/7. Visit our help and advice section. |
| Question | Answer |
|---|---|
| What size is a king size mattress topper? | A king size mattress topper measures 150 x 200cm, matching the dimensions of a standard UK king size mattress. Always check the listed dimensions on the individual product before ordering - some toppers may vary slightly. |
| Should the topper go over or under the mattress protector? | Over. The correct layering order is: mattress, then mattress protector directly on the mattress, then the topper on top of the protector, then the fitted sheet over both. Placing the topper under the protector means the protector cannot do its job of protecting the topper, and the two layers cannot be laundered independently. |
| What king size mattress topper is best for a couple? | It depends on the couple's combined priorities. Memory foam with open-cell or spring-cell technology offers the best motion isolation if one partner is restless. Wool is the most naturally temperature-regulating fill if one or both partners sleep warm. If both partners have significantly different preferences, two single toppers placed side by side on a king size bed eliminates the compromise entirely. |
| Are the Vispring and Hypnos toppers worth the price? | For those with a premium king size mattress, yes. These toppers use the same natural wool and latex materials as the brands' mattress ranges. They are significantly more durable than synthetic alternatives and paired with a quality natural fibre mattress, they provide a genuinely different sleeping experience. If your mattress is a practical mid-range option, the premium tier is less likely to provide proportional benefit. |
| Can a king size topper fix a sagging mattress? | No. A topper placed on a mattress that is sagging or has lost structural support will follow the sag rather than correcting it. If the mattress has visible dipping or no longer provides adequate support, a new mattress is the right solution. A topper works well when the mattress is structurally sound but has lost surface comfort. See our king size mattresses if a replacement is needed. |
| How long does a king size mattress topper last? | It depends on the fill type and quality. Synthetic foam toppers typically last 3 to 5 years with regular nightly use. Premium options with longer warranties - 8 to 10 years on the best memory foam, 5 years on the natural fibre options - reflect genuine confidence in longer durability. Always check the individual warranty terms. |
| Do you offer free delivery on king size mattress toppers? | Yes, free UK delivery is included on orders over £100, which covers all king size toppers in our range. Lead times vary by brand - from 7 to 14 days on most, up to 4 to 5 weeks on the premium Hypnos options. See our delivery page for full details. |
| Can I buy a king size mattress topper on finance? | Yes. Interest-free finance is available on eligible orders. See our finance page for full details on terms, eligibility, and how to apply. |
