Medium-Firm King Size Mattresses Under £150

Kingsize (5')

Designed to provide restful sleep for you and your family, this pocket-sprung memory foam mattress consists of pocket springs and comfort foam material that fits the curves of your sleep. The cushioning layer will help you stay in your sleeping position, keeping your back, shoulders, and neck more comfortable throughout the night. This medium-firm pocket sprung mattress uses individually wrapped pocket spring coils to reduce motion transmission and keep you from being disturbed by your companions. Novilla mattress is the high-quality mattress you deserve.

The mattress arrived quickly, and was well packaged. It expanded to full size pretty quickly after opening, too, and felt fine to sleep on after just a few hours. Decently firm but with a soft topping.. M. Rochester, GB. Wed Mar 04 2026

Kingsize (5' )

Novilla's zoned spring system offers scientific support for all sizes. Individual pocket springs provide zoned support right where you need it most. Tested for durability, Novilla's spring system will provide you with years of comfort. With three layers of foam, this mattress provides extra pressure relief that molds to your body's curves throughout the night. This medium-firmness mattress is suitable for those who change sleeper positions. Unlike traditional mattresses, our individually sprung mattresses have low-motion transfer and will not disturb your partner.

Amazing mattress recently moved into my new property and what can I say This mattress is the best night sleep me and my best friend. I’ve had highly recommend reasonable for price.. Anonymous. Sat Apr 18 2026

Kingsize (5')

This 23cm mattress features pocket-sprung technology with ergonomic zones and individual pocket springs for scientific spinal support. The comfort layer is made from our finest quality foam, catering to different sleeping positions to provide you with a restful night's sleep. The mattress is finished with skin-friendly materials to provide a breathable and comfortable cover. The quilted sleep surface offers edge support. This pocket-sprung mattress is the perfect choice if you are looking for a great mattress for your master bedroom.

Very comfortable mattress, great value. Jennifer. Cork. Wed May 06 2026

King

An Ortho foam quality mattress provides firm orthopaedic support when used on either a divan base or a bed frame, helping to maintain the correct alignment of the spine and neck for a healthier and comfortable night sleep. Please note that fabric patterns may vary slightly from what’s pictured, but the quality remains the same.

Very disappointing experience with Wayfair mattresses. I ordered two foam mattresses (king and double) and specifically explained to the phone consultant that I wanted something similar to a previous mattress I had purchased from Wayfair, which was good quality. Unfortunately, the phone consultant clearly did not understand the request and sent very thin mattresses – around half the depth and significantly poorer quality than expected. Both mattresses were completely unsuitable and had to be returned. I placed the order via phone specifically to avoid errors, as the exact SKU from my previous order was out of stock — making the incorrect items even more frustrating. The returns process was equally frustrating. I was told: - A direct replacement was not possible - I would need to accept Wayfair credit and reorder - Or pay a £40 return fee if I wanted a refund to my original payment method When I asked what would happen if the replacement was incorrect again, there was no clear answer or reassurance and I was. told nothing can be done then. At that point, I had no confidence in reordering. I chose to pay the £40 just to resolve the issue and purchased my mattresses elsewhere instead. Overall, very poor experience: Incorrect product sent Poor product quality Confusing and unhelpful customer service Unfair return charges Would not recommend.. Anonymous. Tue Apr 07 2026

Kingsize (5')

Giving you the perfect blend of comfort and support without the need for a thicker mattress, the 12cm deep Reflex delivers on quality and affordability. Available in Shorty, Small Single, Single, Small Double, Double and King sizes. Topped with a layer of responsive memory foam on a base of reflex foam, all encased in a hypoallergenic Tencel cover, the medium firm comfort level is suited to all sleepers, no matter your position, making it a great choice for guest beds or children’s rooms. The slim profile is also ideal for bunk beds, holiday homes, and caravans. Especially designed to reduce roll-together through minimised movement transfer, this mattress is perfect for couples, and since there are no springs, the noise-free sleep experience helps to reduce waking periods, giving you a more restful night.

Comfy and great for my little boy. Not as thick as I was expecting and if you are slightly heavier then maybe not the best. Gabrielle. Willerby Hull, GB. Mon Dec 15 2025

Kingsize (5')

This full-foam 13-cm-deep mattress has been designed with an open-cell next-generation Reflex Foam, which does not contain any springs, providing medium-firm comfort. The reflex foam is made up of thousands of air bubbles that expand and contract when the sleeper lays on the mattress for firm support. The low-density reflex foam provides both body molding and bounce-back properties, which offer the sleeper a firm yet hugely comfortable sleeping experience while always returning to its natural shape when it is not in use. With a cool, soft, stress-free breathable fabric for both the top panel and the border, this maintains any excess heat, keeping the sleeper at room temperature for a cool, fresh, relaxing night’s sleep. The mattress will be delivered, compressed, vacuum packed, rolled, and boxed for comfortable and easy delivery, making the unpacking of the mattress simple for the customer. Once the mattress has been taken out of its packaging, please allow 24 to 48 hours to allow it to expand to its original size.

A firm mattress and perfect for a narrow single bed!. Anonymous. Cowes, GB. Wed Aug 20 2025

Kingsize (5')

Bring a touch of luxury hotel comfort to your home with this hybrid mattress, boasting a cover of natural Egyptian cotton encasing a traditionally supportive coil sprung base and an eco-friendly comfort layer at the top. The firm comfort level is ideal for back and stomach sleepers, and the breathable fabric gives you a naturally cooler, softer and more restful night’s sleep for a fresh and invigorated morning, whether in your master bedroom, guest room or on a child’s bed. 18cm deep. Available in Single, Small Double, Double and King sizes.

Absolutely pleased with the bed and mattress. Very quick delivery. The bed is beautiful and a great size for the bedroom. Lots of storage underneath. So pleased.. Anonymous. Sun Dec 21 2025

Kingsize (5')

Enjoy restful nights with the Winksleep Open Coil Mattress, designed to combine comfort, support, and durability. Featuring a traditional open coil construction with a quilted top layer, this mattress ensures balanced support for your body while promoting airflow for a cooler sleep experience. Ideal for all sleeping positions, it provides reliable comfort night after night. Crafted with quality materials and built to last, the Winksleep Open Coil Mattress is perfect for those seeking a supportive yet affordable solution for better sleep. Its easy-to-maintain cover keeps your mattress fresh and clean, while the robust coil system offers lasting stability.

Very convenient and nice quality thank you. Todor Todorov . Middletown Co. Armagh. Thu Feb 12 2026

Kingsize (5')

Discover the perfect night’s sleep with the Bedzonline Hybrid Memory Foam & Spring Mattress, designed to combine comfort, support, and eco-friendly craftsmanship. Engineered with multiple layers of ergonomically designed comfort, this mattress promotes spinal alignment and ensures the ideal sleeping posture for restful, rejuvenating nights. Crafted with brand-new open coil springs and ultra-firm polyester filling, it offers a stable yet comfortable foundation that adapts to your body while maintaining long-lasting durability. The mattress features cool-touch, skin-friendly fabrics, isolated comfort layers, and a micro-quilted border, delivering ultimate breathability and hygiene. Manufactured in the UK with eco-conscious processes, the Bedzonline Hybrid Memory Foam & Spring Mattress ensures superior sleep quality with a lower carbon footprint, free from recycled springs and allergens.

Happy with the goods I have bought I have had no problems with anything. Jayne. Blackpool, GB. Sat Feb 21 2026

Kingsize (5')

Sleepy Castle Bonnell Spring Mattress: Revel in unparalleled comfort and superior breathability, meticulously crafted for the ultimate sleep experience. Embrace the luxury of the Bonnell spring system, promising serene nights and rejuvenation. Available in all standard sizes, this dream mattress arrives rolled and condensed in a single box for your convenience. Choose Sleepy Castle for nights transformed into restful escapes.

Kingsize

This pocket-sprung mattress is designed with multiple layers of foam to provide you with a pressure-relieving night's sleep. This 23cm mattress is finished with a soft, breathable, and skin-friendly cover. The foam layer provides cushioning and contouring support as you move around. Novella's pocket springs provide excellent spinal support with medium firmness. The foam layers and pocket sprung work together to evenly distribute your weight and keep you supported throughout the night.

My daughter she likes the bed also the mattress are so comfortable. Fortuna Kedane. London, GB. Mon Apr 06 2026

King (5')

The Orion Bonnell Coil System Quilted Mattress is crafted to deliver optimal support and balanced comfort, making it the ideal choice for bedrooms, guest rooms, and flats alike. Its robust Bonnell coil system ensures even weight distribution and delivers targeted support, which reduces pressure on key areas of the body for healthier sleep posture. Constructed with high-quality materials, the mattress resists sagging and retains its shape over time, providing a dependable sleep surface night after night. Thanks to advanced manufacturing and efficient delivery, the Orion mattress is supplied rolled and vacuum-packed, simplifying transport through narrow doorways and staircases. Simply unbox and unroll—the mattress quickly expands to its intended shape and is ready for immediate use. this mattress is a versatile, budget-smart pick for long-lasting utility and comfort.

Shelagh Le. Westbury-on-trym Bristol, GB. Tue Jun 10 2025