Why our sleep experts loved it
Mammoth has been a little quieter on the mainstream mattress scene in recent years but is one of the more established clinically focused brands out there. The Healthpro Advance that they sell through Bensons for Beds certainly felt like something of a statement piece from them: a tall, premium hybrid with a deep slab of Medical Grade foam sitting on top of a seriously substantial pocket spring unit, all wrapped up in a very modern, health focused sales story.
In the showroom the Healthpro Advance felt like a grown up, no compromise kind of mattress from the moment I lay on it. Officially it is sold as a firm tension, which as a side sleeper usually means alarm bells for me, but the thick foam comfort layer took the edge off that instantly. Lying on my back I felt a very strong sense of uplift and alignment, while on my side my hips and shoulders were able to sink in further than I was expecting for a firm bed, helped in no small part by the actual depth of the foam and the responsive springing below.
Price wise, this sits in the very premium bracket of Bensons ranges and this is not the mattress to pick if you are working with a limited budget. But the specification is unusually high for a high street mattress and if you like the idea of the feel of modern foam and value the health focused design and clinically backed research, I do think it justifies its positioning.
Construction & materials The Healthpro Advance is a 30.5 cm deep hybrid that is built around two core elements: a dual layer pocket spring unit, and a substantial layer of Mammoth's Medical Grade foam above that.
Starting with the springs, you get a total of 3,600 pocket springs in two distinct layers, with 2,000 mini pocket springs sitting on top of a further 1,600 full height springs. The springs are each encased in their own fabric pocket so they can move independently of each other, which in turn allows the mattress to respond to different parts of the body in isolation and isolate movement between partners more effectively than an open coil unit would. The smaller mini springs towards the surface give the mattress a slightly more responsive, bouncier feel, while the deeper full height springs take care of the brunt of the core support.
On top of this is a 60 mm layer of Mammoth Medical Grade foam, which is zoned into three distinct areas to give you firmer support through the middle of the mattress where your hips and lower back rest, and slightly softer comfort towards the shoulders and legs. This is not slow sinking memory foam. Mammoth originally developed this material to use in healthcare environments to relieve pressure, encourage better circulation and help patients move more freely, and it is engineered to offer better pressure relief while also cooling faster than traditional memory foam.
Cut into that foam are Mammoth's PostureCell structures. These are like small, individual columns that can move independently within the foam as you sit or lie on it. It allows the surface to contour more precisely to your body curves, while at the same time creating air channels between each PostureCell, which in turn improves temperature control and moisture management across the night.
Rounding the edge of the mattress is the Edgemax system, a high density foam encasement that stiffens up the side walls and perimeter of the mattress. This helps to reduce that feeling of roll off when you are sitting on the side of the bed and also helps to make the full surface of the mattress more usable, all the way to the very edge. This can be especially useful if you share a bed with a partner and want a wider usable area, or if you are choosing a smaller size.
The whole thing is then finished with Mammoth's Wave performance fabric, a soft, knitted cover that is said to be infused with carbon particles to keep the surface fresher and more balanced in feel. Underneath that is a deep, responsive quilted top that adds a little extra touch of plushness the second you sink down onto the mattress. The cover and all of the fillings in the mattress are described as hypoallergenic and resistant to common allergens and dust mites, which will be a good selling point if you are sensitive.
It is a rotate only mattress, so you never flip the mattress over. There are flag stitched handles on the sides to help with moving it and also with the necessary rotation, which you will be glad of because at over 30 cm deep and packed with springs and foam, this is a heavy piece of kit. You also get a 10 year guarantee and Bensons UK manufacture in a factory that holds respected industry quality marks, which are all positive signs of decent quality control.
Firmness & feel The Healthpro Advance is only available on Bensons scale as a firm tension. In practice I would say the feel is firm through the core with a noticeably cushioned, almost pillow top feel on the surface, so a combination of a strong, stable base with a slower, more enveloping top layer feel.
Lying on my back I felt an instant sensation of height and stability. The 3,600 springs create a very dense, solid base that stops your pelvis dipping into the middle and helps to keep you on a flatter plane. The zoned Medical Grade foam then gives your hips a little place to nestle, while holding your lumbar region in a very neutral position. I did not feel any obvious hard spots between my shoulder blades or in the lower back area, which is something that does tend to happen to me on cheap firm mattresses.
Lying on my side, which is usually the position where firm mattresses are at their most unyielding, I was in fact pleasantly surprised. I went in expecting something quite unyielding but the combination of that deep foam and the softer mini springs in the top layer allowed my shoulder and hip to sink in enough that I did not feel that familiar side sleeper pinch. I would not call this mattress soft at all, and lightweight side sleepers may still struggle here. But for average to larger body builds who like a supportive feel, it strikes a good balance between firmness and sink.
The same is true of stomach sleeping. The firmer tension through the centre third of the mattress means that you do not bow your midsection into the mattress, which is a big plus if you have lower back niggles when you sleep on your front.
In terms of responsiveness, the Medical Grade foam does not give you that ultra slow, stuck in the mud sensation that you get with older memory foams. Instead, it is more of a cushioned, slightly springy cradle that recovers relatively quickly when you shift position. You can roll from back to side without feeling trapped, and the pocket springs underneath help to create a subtle bounce back as you move and change posture.
Performance & support The real standout element of the Healthpro Advance for me is the level of support, where it absolutely nails it and earns its premium label. The combination of the dual layer pocket spring system and zoned foam keeps the spine on a more level plane, particularly through the hips and lower back. The centre of the mattress feels slightly more resistant, which is where you want that extra pushback, and the top and bottom thirds feel more forgiving for the shoulders and legs.
For back sleepers that results in a very confident, almost orthopaedic style of support, but with a far more luxurious top. If you have been told you need a firm mattress but really dislike the very hard, basic feel of cheaper options, this strikes a happy medium between the two. The foam takes the edge off the firmness without undermining it.
The same is true for side sleepers and pressure relief over the shoulder and hip. The combination of 60 mm of foam and those independent PostureCells means you still sit higher on the mattress than you would on a true soft or medium tension, but you do not get those sharp pressure points that can wake you up and keep you tossing and turning. I would steer very lightweight side sleepers or those who prefer a deeply squishy feel of a plush mattress elsewhere, but for average to heavier builds or mixed sleepers who rotate between back and side, this firm but still quite forgiving setup works well.
The same principle holds true for motion isolation. With 3,600 individually nestling springs and both the foam comfort layers absorbing movement on the top, there is very little ripple when you roll over in bed. Partner disturbance will not be completely eliminated but compared to a more open sprung mattress, it is noticeably better contained.
Edge support is good thanks to the Edgemax foam encasement around the perimeter. Sitting on the side of the bed feels firmer than many pure foam mattresses, with less of that roll off feeling, and if you lie right up at the edge of the bed it still feels quite secure. If you use every single inch of your mattress because you share with a partner who tosses and turns, that wide usable area is a real plus.
As with any thick, quilted top mattress, you do get a little bit of a settling in period during the first few weeks. Rotating the mattress head to foot on a regular basis, particularly in the first year or so, will help to distribute the wear more evenly across the whole surface and avoid exaggerated body impressions in your usual sleeping areas.
Temperature regulation Deep foam mattresses can sometimes feel a little on the warm side, so it is worth spending a little time looking at how the Healthpro Advance manages heat. Mammoth's Medical Grade foam is engineered to be more breathable and naturally cooler than traditional memory foam, with an open cell structure that is designed to help encourage airflow.
The PostureCell cuts through the foam create vertical air channels throughout the comfort layer that help move away warm air and moisture, rather than having it get trapped next to the skin. The pocket springs themselves also add another layer of airflow under the foam, while the Wave performance fabric cover is intended to help maintain a fresher, cleaner surface over time.
In practical terms, lying on it in the showroom, it has the softly cocooning feel of a deep foam mattress but without that immediate build up of clamminess that you can get on some old school memory foam beds. I think that for moderately warm sleepers you will be fine here, particularly if you invest in a good set of breathable bedding to go with it. If you are an extremely hot sleeper or live in a hot climate, you may still prefer something with less foam or more active cooling technology built in, but for the vast majority of people this sits in a comfortable middle ground between hug and breathability.
Practical features On a practical level the Healthpro Advance does a fairly decent job of justifying its high price tag. It is an easy care, rotate only mattress, which means that you never actually have to flip the mattress over. You just rotate it from head to toe as per the care guide, and use the flag stitched handles on the side panels to help with moving and rotation, which is a nice touch. Given its depth and weight, that rotate only aspect is particularly welcome.
Bensons back it up with a 10 year guarantee for manufacturing defects and also their comfort guarantee, which allows you to exchange the mattress for a different tension if you do not quite like the feel, providing you use a protector and are happy to cover the exchange fees. For a mattress at this investment level, that kind of safety net is very reassuring.
It is available in all of the usual UK sizes from single right up to super king, and it arrives with a little more environmentally conscious packaging made from a mix of sugar cane and recycled plastics, which is a nice extra if you are trying to shop a little more sustainably. Bensons also offers a mattress recycling and dismantling service for your old bed at an additional cost so that they can take the old mattress away on delivery day.
The only real caveat is that this is a very deep, fairly heavy mattress. If you have a bed frame with a high footboard or very shallow side rails, it is worth checking the measurements before you buy. You may also find that you need extra deep fitted sheets to accommodate the 30.5 cm profile.
Who it suits I would recommend the Mammoth Healthpro Advance to back sleepers who like a firm, stabilising feel but who do not want to sacrifice that initial cushioned comfort. The way the Medical Grade foam and the dual layer springs work together gives you that classic supportive, orthopaedic style base with a noticeably more forgiving top, which is ideal if you have a history of niggly backs but really dislike rock hard beds.
It also works well for many side sleepers and combination sleepers, particularly those of average to higher body weight, who want deeper pressure relief through the shoulders and hips without slipping into a soft mattress. For the time I spent lying on my side I found there was enough give in the mattress to avoid numb shoulders yet never felt like I was sinking into that hammock shape.
Couples will also appreciate the motion isolation, the generous depth and the reinforced edges, all of which makes the mattress feel larger and more usable. The hypoallergenic construction and health, cleaner sleep surface story will also appeal if you are prone to allergies or simply want a mattress that has been designed with health as well as comfort in mind.
Who it does not suit If you know you love a soft or classic medium tension, this is not the mattress to make you change your mind. The comfort layers do take a lot of the hardness out of the feel, but at its heart this remains a firm mattress. Very lightweight side sleepers, in particular, may still find it a bit on the unyielding side over the shoulder area and be better off on a softer tension all together.
If you are an extremely hot sleeper, or someone who dislikes the sensation of being wrapped and cradled by foam, you may also want to look at something with less foam or more obvious cooling features. The Healthpro Advance is cooler and more responsive than the old school memory foam beds, but it still has that wrapped, cushioned sensation that not everyone enjoys.
Finally, if you are on a tight budget or buying a mattress for an occasional use guest room, the price will be difficult to justify. This is very much a flagship, long term investment mattress and it makes more sense if you are going to be sleeping on it every night and really value the clinical heritage behind the design.
Final verdict The Mammoth Healthpro Advance felt like something of a return to form for a brand that has always marched to the beat of its own drum. It combines an impressively specified spring unit with a genuinely advanced foam comfort layer, and then wraps it all up in a package that feels solid, supportive and well engineered.
In the showroom it felt like a firm but deep comfortable mattress that managed to keep my spine well aligned on my back while still offering enough sink and contouring to keep me happy on my side, which is not an easy balance to pull off. Add in the strong edge support, the hypoallergenic build and cleaner sleep surface story, the long guarantee and the health sector heritage behind the materials used, and it starts to look like a very compelling option in the premium hybrid space.
It will not be for everyone. The price is high, the feel is unequivocally on the firm side, and very hot sleepers may still want something with less foam or more active cooling. But if you are a back or mixed sleeper who likes a supportive mattress with a generous foam top, and you are happy to invest in a bed that is built to last, the Healthpro Advance is one of the more impressive firm hybrids available at the moment on the high street, and a strong reminder of why Mammoth built its original reputation in the first place.
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