King Size Mattresses

The Simba King Bed mattress is suitable for all standard UK King size beds, measuring 150cmW x 200cmL, but the depth of your king size mattress depends on the range and model you choose. For example, our Earth range is packed with some of nature’s best materials and our signature sleep tech, with our Apex model measuring 30cm deep; our Deluxe range has the Hybrid® Luxe, which comes in at 31cm, and the Hybrid® Ultra, our deepest mattress at 34cm. But our Comfort range has a smaller depth, with our Hybrid® Essential just 20cm deep. That why we suggest checking these details before buying. 

We also offer a range of slightly wider European Queen Mattresses, and for an even more luxurious sleep space have a look at our Super King Size Mattresses. 

Head over to All Mattresses for more details about our range. 

King size mattresses generally offer plenty of sleep space without taking up the whole bedroom; they’re perfect if you like to stretch out, and they’re ideal for couples. But here at Simba our King size mattresses are engineered with award-winning sleep tech, designed to limit your partner’s movement and offer a fresher sleep. 

If you’re concerned you may not have room for a king size mattress, don’t worry; we offer a wide variety of Double Mattresses which feature all the same ingenious tech for fresher sleep and balanced support. We also have Small Double Mattresses, as well as Single Mattresses if you prefer a twin bed set up. 

Every Simba Hybrid® King size mattress is packed with our unique, problem-solving sleep technology. It’s engineered to help you sleep longer and deeper, all night and every night, thanks to our innovative Aerocoil® springs and our Simbatex® foam. That goes for both our wallet-friendly Comfort range, and our luxurious Deluxe range.

There’s a lot of confusing information out there for you to think about when you’re buying a mattress. But the Simba Earth mattresses are in a class of their own– with a unique blend of our signature tech with some of Nature’s best materials and a truly luxurious take on sleep.    

They all feature a range of hand-tufted layers, including our innovative, sonically welded Quadcore™ base which helps facilitate a more efficient and complete recycling process. 

Which is Simba’s best king size mattress for my sleeping position? 

Back and side sleepers need zoned support for areas like shoulders and hips, while front sleepers need reliable support to promote the correct alignment of the neck and spine. 

Our Hybrid® king size mattresses offer excellent support for all sleeping styles; the combination of our patented Aerocoil® micro springs with supportive foam is designed to help your body stay comfortably aligned however you sleep. 

Recommended King Size Bed Mattress: Any of our Hybrid® King size mattresses 

Whether you just have different routines, or one of you is a light or fidgety sleeper, being woken up by your partner is one of the most common sleep problems. 

Our unique Aerocoil® springs in our Hybrid® mattresses are designed to offer tailored support to each partner, and to limit the transfer of movement from one partner to another; their conical design means they compress inwards rather than sideways, and their small but mighty size, means they’re able to work unnoticed at the top of the mattress for optimum efficiency. Especially across our Deluxe range. 

Recommended King size mattress: If your budget allows, it’s a good idea to opt for the models with the highest number of springs, which is the Hybrid® Ultra mattress or the Hybrid® Luxe mattress. 

You may not be aware, but your body temperature naturally drops a few degrees when you sleep; that process is interrupted or even blocked if you’re too warm, and sharing a bed can make it worse. 

But the good news is that all our king size mattresses are designed to help keep you cool. The patented Aerocoil® springs in our Comfort and Deluxe ranges help push air gently through the top layers, while the Simbatex® foam offers fresher airflow than dense memory foam. As for our Earth range, they feature  natural mattress materials to help you stay fresh and comfortable all night long. 

Recommended king size mattress: All our king size mattresses are designed for cooler sleep, but we recommend our Earth range king size mattresses to stay fresher naturally. 

Waking up with aches and pains can be a sign of incorrect spinal alignment or poor support. We’re not medical professionals, so we can’t judge what’s right for your back. What we can say is that we’ve received huge amounts of positive feedback from people who say they’ve suffered from aches and pains, and our Simba mattresses have helped them to reach a great night’s sleep.

Recommended king size mattress: the Hybrid® Luxe or Ultra. 

It’s important to us that everyone has access to great sleep, whatever their budget. That’s why we developed our Simba Comfort range, which offers our signature mattress technology at a comfortable price. Go for our most wallet-friendly option, our Simba Hybrid® Essential King Size Mattress, our Hybrid® Inter or our ground-breaking Hybrid® Original. 

Recommended King size mattress: Any of our Comfort mattresses. 

If you’re still not sure which king size mattress is best for you, have a look at All Mattresses. 

We offer free delivery on your king size mattress, even in sale periods. Mattresses in our Comfort range and Deluxe mattresses will arrive vacuum packed and boxed, so it’s a lot easier to get up the stairs. Others – like our entire Earth range – are unboxed and flat, so they include VIP delivery to a room of your choice. 

You have 200 nights to decide whether you are happy with your purchase. But if things aren’t quite as you’d like, we’ll come and collect your king size mattress from you, free of charge.   

We’re confident all our Simba mattresses will go the distance, which is why we offer a 10-year guarantee on all new mattresses. Manufacturing faults are rare, but if you stumble across any, just let us know and we’ll replace it with a brand new one.

Yes, any king size mattresses that are returned to us are rigorously inspected. Then they’re either recycled or refurbished by our trusted third partners. Not only is this process more responsible, but it also gives everyone the opportunity to enjoy the full Simba sleep experience at a fraction of the price. 

We check, deep clean and sanitise very single component, replacing parts where necessary, before a final inspection to receive a certified Simba guarantee.   

For more information check our range of Refurbished Mattresses. 

We don’t want any of our mattresses to end up in landfill, so all the king size mattresses for sale at Simba are suitable for recycling via our collection service or specialist providers; those returned in your 200-night trial (or under our 10-year guarantee) are refurbished, and any with too much wear and tear are recycled. Once your mattress reaches the end of its life, our site has a specialised Simba Mattress Recycling Service where you pay a small fee, and we come and collect it for you. Any brand, any size – no Simba purchase necessary.

Find out more about our Mattress Recycling Service here.

You’ll be relieved to hear you don’t need to flip your Simba King size mattress over in the whole time you have it. We do, however recommend however that you rotate your Comfort or Deluxe mattresses 180° once a month for the first three months, then once every three months for the rest of its life. As for our king size Earth mattresses, once every six months after the first few months will do the trick, so your natural mattress fillings stay comfortable for longer. 

To keep it clean, Simba mattresses in our Comfort and Deluxe ranges feature a machine washable cover you can zip off and on again as required; it’s also a good idea to invest in one of our quilted cotton Mattress Protectors to protect your mattress from accidental spillages and general wear and tear. 

Absolutely. The largest mattresses we offer are the Super King mattresses, while for longer, European size beds we have European Double Mattresses and European Queen Size Mattresses. 

If you're going to treat yourself and buy a king size mattress, it makes sense to ensure you have a fantastic bed base to go with it. We have a range of bed frames to suit every need, from our clutter-clearing Ottoman bed bases to our beautifully simple Wooden beds. And because sleep is personal, you can choose your fabric, headboard design and desired storage on selected premium beds.

There’s actually no universal industry system that compares a ‘firm mattress’ with a ‘medium-firm’ mattress. So we designed our Hybrid® king mattresses to offer supportive body alignment alongside soothing pressure relief, and here at Simba HQ we rate them as medium-firm.