King Size Memory Foam Mattresses

Are you unsure about the benefits of memory foam or whether a king-size mattress will suit your needs? We've answered some of the most frequently asked questions about king-size memory foam mattresses to give you all the information you need to choose the perfect mattress with confidence.

A memory foam king-size mattress is 5’ x 6’6" or 150cm x 200cm, perfectly sized to fit a king-size bed! As its large size suggests, a 5ft memory foam mattress is a must-have for anyone who loves to sleep with plenty of space. They're great for couples to sleep without bumping into each other or for solo sleepers to have the most luxurious sleep.

Not sure if this size will suit your needs? Our mattress size guide explains the sizes available to help you make the right choice for your space and sleep needs.

It’s always a good idea to check the measurements of your bedroom first to ensure a king-size mattress will fit with enough space to move around the room. A room size of at least 9ft6" x 10ft (2.9m x 3.05m) is often considered sufficient to accommodate a standard UK king-size mattress.

One of the biggest concerns with king-size mattresses is often the access to get the mattress into the bedroom. Before the delivery of any new mattress, measure up your space and size up your entryways, doors and hallways to ensure your item will fit into your home. Consider the route that provides the best access for the items you have ordered and clear furniture that could be in the way on the route to your desired room.

Check out our bed measuring guide for more guidance.

There are many benefits offered by a king memory foam mattress, including:

• Space: the second biggest mattress size in the UK, a king-size memory foam mattress provides oodles of space to stretch out. Ideal for taller sleepers, couples, or anyone wanting more room to relax.
• Responsive memory foam: the innovative memory foam will mould to your body throughout the night, using your body heat to help alleviate pressure on your body. Because it absorbs movement, one partner’s tossing and turning is less likely to disturb the other, making bed-sharing more comfortable.
• Prevents and soothes aches and pains: sleeping on a king memory foam mattress can help relieve existing aches and pains and prevent new ones from developing by reducing pressure points on your hips, spine, and other joints. The memory foam material does this by distributing body weight evenly, giving support where you need it.
• Durability and shape retention: unlike other mattress types, a high-quality king memory foam mattress tends to keep its shape longer and avoid sagging over time.
• That sink-in feeling: the hug of a king memory foam mattress is perfect at the end of a long day!

Want to find out more about this innovative mattress type? Our memory foam mattress guide answers some of the most frequently asked questions, and our general mattress buying guide explores other types if you want to compare!

Our king-size memory foam mattresses are available in all our most popular firmness levels, including:

• Soft
• Soft-medium
• Medium
• Medium-firm
• Firm

Something you might see with memory foam is that it might be described as 'low density' or 'high density'. This relates directly to the firmness levels, with a higher-density mattress featuring more foam per cubic foot, which makes it heavier and more supportive. Lower densities, such as soft memory foam mattresses, will return to their original shape faster!

So, whether you want the extra support a firm king-size memory foam mattress provides or would rather splurge on the comfort of a softer rating, our range has something for every sleeper.

When choosing the best king-size memory foam mattress for your needs, consider the following factors to ensure comfort, support, and long-term satisfaction:

• Firmness level: choosing the right firmness level helps keep your spine aligned and aids pressure relief. Side sleepers often prefer a soft mattress, while back and stomach sleepers tend to benefit from medium to firm options.
• Material composition: memory foam mattresses vary in foam density, layering, and additional materials used for comfort or support. High-density foam mattresses typically offer better durability, while gel-infused or open-cell options enhance breathability.
• Body weight and sleep position: heavier sleepers often need firmer, more supportive memory foam to prevent sagging, while lighter sleepers may prefer softer options.
• Temperature regulation: look for technology designed to regulate your body temperature to maintain a comfortable sleep environment.
• Budget: it’s important to find one that delivers great value without stretching your budget. Happy Beds offers a range of affordable options that combine comfort, quality, and support at prices that won’t break the bank.

With a wide range of affordable king memory foam mattresses in various firmness levels, we’ve got something to suit every type of sleeper. Whether you're looking for something new to try, furnishing a guest bedroom or want to upgrade your old mattress, buying from Happy Beds means you get to enjoy some of our fantastic benefits, such as:

• Quick delivery: there's no need to get poor-quality sleep anymore, as we have mattresses in stock and ready to be delivered with our standard and premium delivery services.
• Manufacturer's guarantee: give yourself peace of mind with the knowledge that your new king-size memory foam mattress comes with a 5-year guarantee as standard!
• Simple payment options: whether you want to pay for your purchase up front or spread the cost with a 0% interest finance option from Klarna or PayPal, we've got plenty of ways to pay.
• Helpful customer service: whether you want to find out something before purchasing or have a query after delivery, our dedicated customer service team is here to help.
• Mattress recycling: add our mattress recycling service to your basket, and we'll take your old mattress away! Check our mattress recycling guide to find out what you need to do to prepare it for recycling.