King Size Memory Foam Mattresses

King Size Memory Foam Mattresses - Explore Our Selection

If you’re tired of feeling cramped on a double, you’ll notice the difference right away: more room to stretch, less bumping into your partner, and no more cold feet hanging off the end. For couples or anyone who values extra space, upgrading to a king is the ultimate comfort move.

Sleepy Piglet makes finding your mattress simple. Browse our king size range online and enjoy free delivery direct to your door, plus a 100-night trial for peace of mind. No queues, no hassle. Just spacious, luxurious sleep made effortless.

Why Choose a King Size Memory Foam Mattress?

Why go big? Because size matters. A standard double memory foam mattress is 135cm wide. That gives two adults just 67.5cm each. That is less space than a baby has in a cot. Crazy, right?

The Luxury of Space

A king size memory foam mattress is different. It is 150cm wide and 200cm long (5ft x 6ft 6in). This means you can sprawl and flip without kicking your partner. Tall people love the extra length. No more cold feet hanging off the end.

Pressure Relief That Hugs You

Memory foam is magic. It moulds to your shape, hugs your hips and cradles your shoulders, which stops pressure points. You know that ache in your lower back? A king size memory foam mattress helps fix that. It supports your spine, keeps you straight and you wake up feeling fresh.

No More Waking Each Other Up

We call it 'motion isolation'. It means movement doesn't travel. If your partner gets up for water, you stay asleep. If they toss and turn, you don't feel a thing. The foam absorbs bounce, making it perfect for light sleepers. It really saves relationships.

Built for Durability

A king size memory foam mattress from Sleepy Piglet is made to go the distance. It uses quality materials and expert craftsmanship. The mattress keeps its shape for years, supporting you every night. Our 10-year guarantee says it all. We stand by our promise of long-term comfort.

Hypoallergenic for Peace of Mind

Allergies can ruin your rest, but our memory foam mattresses are hypoallergenic. Dense foam blocks dust mites and pollen from burrowing in. This makes your sleep cleaner, your air fresher, and your mornings brighter, especially if you or your family suffer from allergies.

Perfect for Families

Got kids or pets who hop into bed? Or maybe you simply like a lot of room for everyone. A king size memory foam mattress welcomes the whole family. It is great for story time or weekend cuddles. Everyone fits, and everyone wakes up with a smile.

Features of Our King Size Memory Foam Mattresses

Not all foams are the same. Some are cheap, some get hot, but ours are different. We use top tech that we design for British sleepers.

• Stay Cool All Night

People worry about heat. 'Will I get sweaty?' Not with us. Old foam trapped heat, but our new tech fights it. Take our Ice Cool Gel 2000 Mattress. It has a special cooling gel. It pulls heat away from you and keeps the surface cool. You sleep at the right temperature, even in a summer heatwave.

• Built to Last (And Never Rolled)

We do things differently. Most online shops squash their mattresses. They roll them into tiny boxes to save money. But it hurts the mattress. It damages the springs and ruins the foam structure. We never do that. We deliver your full memory foam mattress king size, full size and pristine. It means your mattress lasts longer and stays supportive for years. We back this with a 10-year guarantee.

• Hybrid Support

We mix things up. We use memory foam on top for comfort and pocket springs underneath, up to 2000 of them. This is a 'hybrid', which gives you the soft hug of foam. But you also get the strong support of springs. It is the best of both worlds. The springs let air flow too, which helps keep things fresh.

How to Select the Right King Size Memory Foam Mattress

Picking a mattress is personal. What works for me might not work for you. Don't just guess. Think about how you sleep.

Check Your Room Size

First things first. Measure your room because the king size is big. It is 150cm x 200cm, so make sure it fits and that you have space to walk around it. Check your stairs too, because our delivery team needs to get it up there. Since we don't roll them, they are big items.

What is Your Sleeping Style?

• Side Sleepers - You need to sink in, as your shoulder and hip dig down. A Medium or Medium-Soft feel is great because it relieves that pressure.
• Back Sleepers - You need balance and support for the lower back, which is key. A Medium-Firm mattress is often best. It stops your hips from sinking too deeply.
• Front Sleepers - You need flatness. If the bed is too soft, your back arches. That hurts. Go for Firm or Extra Firm as it keeps your spine level.

Consider Your Weight

Are you light? A firm bed will feel like a rock, so go softer. Are you heavier? A soft bed will offer no support, so go firmer. Our buying guide suggests heavier individuals (over 16 stone) look for Firm support to keep the spine aligned.

Comparing King Size Memory Foam Mattresses

Let’s find the best king size memory foam mattress in Sleepy Piglet’s collection.

The Cool Choice - Ice Cool Gel 2000

Do you overheat? This is for you.

• Feel - Medium/Firm.
• Best for - Hot sleepers and back and side sleepers.
• Key Feature - Cool gel layer prevents night sweats.

The Luxury Choice - Premium Memory Pocket 2000

Want that hotel feel? This is it.

• Feel - Medium/Firm.
• Best for - Couples and comfort seekers.
• Key Feature - Deep layer of memory foam on 2000 pocket springs. Superb motion isolation.

The Support Choice - Firm Flex Ortho 2000

Have a bad back? Need solid support? Look here.

• Feel - Extra Firm.
• Best for - Front sleepers. Heavier people. Back pain sufferers.
• Key Feature - Orthopaedic support foam. Keep your posture perfect.

Every king size memory foam mattress we sell is made in the UK. We don't import cheap rubbish. We support local jobs and ensure compliance with British safety standards.

Mattress Firmness Guide

Confused by 'Medium' or 'Firm'? Let's make it simple. Here is a quick guide to help you pick.

Confused by 'Medium' or 'Firm'? Let's make it simple. Here is a quick guide to help you pick.Still not sure? Don't worry. You can email us. We are sleep geeks, so we love talking about this stuff. We will ask you a few questions and tell you which one best fits your situation.

Purchase Your King Size Memory Foam Mattress Today

You spend a third of your life in bed. Think about that, 8 hours a day. That is a long time to be uncomfortable.

Upgrade to a king size memory foam mattress with Sleepy Piglet. It is safe, simple and hassle free.

• Order online

It takes 5 minutes. Pick your mattress right from your sofa, your bed, or even during a TV ad break.

We offer the best king size memory foam mattress online. Add to cart, checkout, and relax. You are sorted in a few clicks.

• Free Delivery

We bring it to you, usually in 5-10 working days. You do not need to arrange a van or drag a mattress home from the shop. We contact you about your delivery, keep you updated, and handle everything so you can just focus on better sleep.

• Old Mattress Gone

We can take your old lumpy one away. Just select the option at checkout. No trips to the tip for you. You do not need to break a sweat or clutter your hallway. We recycle responsibly, making it easy to start fresh. Customers rate this service 4.8/5. It really makes moving to a new mattress stress free.

• Risk-Free

Sleep on it for 100 nights and really test it. Live with your mattress, see how you feel, and decide for yourself. We recommend sleeping on it for at least 30 nights first. This can give your body enough time to adapt to the new feel. If it still doesn’t feel right after that, you can simply ask for a free exchange.

Do not settle for bad sleep or a small bed. You deserve the royal treatment. Browse our range now and find your best night’s sleep with just a click.