Why our sleep experts loved it
I went into store already fond of Mammoth as a brand, and the Healthpro Ultra instantly reminded me why. It feels unapologetically premium from the moment you sit on it, with that deep, slow-response memory foam feel on top and a very substantial, supportive core underneath. As a back and side sleeper I found it genuinely comfortable in both positions, and that lovely gentle warmth that builds up in the foam felt cocooning rather than clammy. The price is definitely on the high side, but this is very much Mammoth doing what Mammoth does, a health-focused hybrid that feels like a serious investment rather than an impulse buy.
Introduction The Mammoth Healthpro Ultra is a chunky hybrid mattress at the premium end of the Bensons for Beds range. It combines a very high spring count with Mammoth's signature Medical Grade foam and clever PostureCells cut into the top layer to fine-tune pressure relief and airflow. On paper it reads like a mattress engineered around spinal health and clinical credibility rather than fashion, and in person it mostly lives up to that promise.
In store it came across as a properly substantial mattress, the sort you expect to last a long time. It is rated medium firm, but that sits beneath a generously quilted surface and a deep foam comfort layer, so the first impression is plush and welcoming, then you feel the underlying structure keeping you aligned. If you already like Mammoth's house feel, this is very much in that mould, just cranked up a notch in both specification and price.
Construction & Materials At the core of the Healthpro Ultra is a dual-layer pocket spring system with a quoted total of 4,600 springs in a king size, a blend of 3,000 mini springs closer to the surface and 1,600 deeper, full-height pocket springs. Each spring is housed in its own fabric pocket so they can respond individually, which is what gives you that combination of tailored support and reduced partner disturbance. The minis take care of the finer contouring, while the full-height springs act as the main support engine for your spine and joints.
Above this is a 60 mm slab of Mammoth's Medical Grade foam, zoned into three distinct areas to offer more targeted relief through the shoulders, hips and lower back. The zoning is there to help keep your spine in a more neutral position overnight and to reduce hot spots where pressure can build up. From lying on it, you can feel your heavier areas settling in a touch more deeply while your midsection stays nicely supported, which is exactly what this sort of construction is designed to do.
Cut into that foam is Mammoth's PostureCells technology, small individual cells that move more independently than a solid block of foam. The idea is that they contour more precisely to your body while also allowing air to move between them. Those air channels are there to help move away heat, moisture and allergens, so you get a cleaner and drier sleep surface than you might expect from a standard slab of dense memory foam.
The perimeter is wrapped with Mammoth's EdgeMax system, a high density foam border designed to stop the edge collapsing and to maximise usable surface area. This definitely feels like a deep, serious mattress, with a quoted height of about 33 cm, so visually it looks very plush on the bed and you do notice the extra depth when sitting or getting up. A deeply quilted top layer adds a final touch of loft and softness so you do not feel the zoning underneath in a blocky way, just a consistent, cushioned surface.
On top of everything is WAVE performance fabric, which uses carbon particles in the sleep surface to help keep things fresher and more balanced. The overall spec also includes a hypoallergenic surface, which is useful if you are sensitive to dust mites, along with sturdy flag-stitched handles and an easy-care, rotate-only construction.
Behind the scenes, Mammoth leans quite heavily on its health credentials. The Healthpro Ultra is made in the UK in a factory that holds respected industry accreditations, and Mammoth is the only sleep brand with an official partnership with the Chartered Society of Physiotherapy, drawing on their input for design and testing. The mattress also arrives in more sustainable packaging that blends sugar cane and recycled plastics, a nice touch at this price.
Firmness & Feel Bensons grades the Mammoth Healthpro Ultra as medium firm, and that is exactly how it felt to me in store, perhaps marginally on the firmer side of medium once you get past the pillowy top quilting. When you first lie down, there is a satisfyingly deep, slow sink into the Medical Grade foam. It is not marshmallow soft, more of a gently enveloping hug that quickly warms to your body temperature and softens fractionally as you lie there.
On my back, my shoulders and hips sank in just enough to feel cradled while my lower back stayed supported rather than hanging. There is a clear sense of the springs and zoned foam working together, the foam smoothing out the pressure and the springs providing the firm underlay. I did not feel any obvious hard lines from the zoning, it all blends into a single, supportive surface.
On my side, the foam allowed my shoulder to nestle in nicely without the sort of sharp pressure you sometimes get on a firmer, more traditional pocket sprung mattress. My hip sat comfortably in the surface, and crucially I did not feel as though I was tipping into a hole, which can be a risk with very thick memory foam layers. For my build it felt like a very comfortable balance between contouring and structure.
There is that classic Mammoth warmth to the feel. The foam does respond to body heat, so after a few minutes you notice the surface becoming more pliable and more tailored to your shape. I found that quite soothing and cosy, particularly imagining it in a cooler UK bedroom, and it was something I actively liked about this mattress. If you have tried very cold-feeling hybrids and disliked them, you may really appreciate this more welcoming surface.
Performance & Support In terms of support, the Healthpro Ultra does a convincing job for both back and side sleeping. The combination of a high spring count and zoned Medical Grade foam means your spine is held in a reasonably neutral line without feeling as though you are on a board. On my back, there was no sense of my hips sinking too far, and on my side the mattress allowed enough give under the shoulder that my neck did not feel cranked when paired with a suitable pillow.
The dual-layer spring system also helps the mattress adapt as you move. Rolling from your back onto your side is smooth, with the minis and deeper springs taking up your weight in a gradual way so you are not bouncing around. That, paired with the thick foam comfort layer and PostureCells, should make this a strong option for combination sleepers who shift positions a lot through the night.
For couples, the motion isolation felt very good for a sprung mattress. The individually wrapped springs already cut down on movement transfer, and the deep foam layer on top further dampens sharp jolts. If your partner is restless or works shifts, this has a good chance of keeping their movements from travelling right across the bed, particularly in the larger sizes.
Edge support is often a weak point on foam-heavy hybrids, but the EdgeMax border worked well enough in store. Sitting on the edge you do see a bit of sink from that thick comfort stack, but you do not feel like you are sliding off. Lying close to the edge felt reassuringly stable, so you can comfortably use the full width of the mattress, which is handy if you share and need every centimetre.
Given the depth and density of the build, this will likely be a supportive option for a fairly wide range of body types, though if you are significantly heavier you may find the medium firm feel nudging closer to medium. Conversely, very light sleepers may perceive it as a touch firmer. The overall impression, though, is of a mattress that has been engineered to provide robust, repeatable support night after night rather than something that will sag quickly.
Temperature Regulation The one area where people sometimes hesitate with Mammoth and other foam-rich designs is temperature. The Healthpro Ultra does feel like a mattress that leans slightly warm and cosy rather than cool and crisp. When I lay on it for a while in store I could feel the foam gently warming under me, and that contributed to the enveloping, relaxing sensation that I actually enjoyed.
That said, Mammoth has built in some sensible cooling measures. The PostureCells cut-outs create channels within the foam so air can move more freely, and the open structure is designed to help carry away heat and moisture rather than trap it. On top, the WAVE performance fabric with carbon particles is intended to provide a fresher, cleaner-feeling surface and to help balance heat build-up compared to a standard knit cover.
In practical terms, if you are an average or slightly cool sleeper, I think you will find the warmth of the foam pleasant, especially in a British climate. If you are someone who sleeps very hot, or if you are already fighting summer temperatures in a loft bedroom, you may still find this a touch too insulating. Pairing it with breathable natural fibre bedding and a lighter duvet in warmer months would be a sensible idea.
Practical Features This is a no-turn mattress, so you do not have to flip it over, which is a relief given how deep and substantial it is. You will, however, need to rotate it head to toe from time to time, and the traditional flag-stitched handles on the sides make that easier. I would still treat it as a two-person job, simply because of the depth and weight.
At 33 cm tall, the Healthpro Ultra is noticeably deeper than a standard mattress. That looks luxurious on many bed frames but it is worth checking your setup. Shallow boxed frames or frames with high guard rails may not suit it, and you will almost certainly want deep fitted sheets to avoid them pinging off the corners. The extra height does, however, make getting in and out of bed feel more effortless for many people.
The hypoallergenic sleep surface, the use of WAVE fabric and the airflow through the PostureCells all contribute to a cleaner, more hygienic sleeping environment. That will appeal if you are sensitive to dust or suffer from allergies, and it fits neatly with Mammoth's broader health-led positioning.
Backing everything up is a generous 10 year guarantee from the manufacturer, which gives some reassurance given the premium price tag. Bensons also layers on its comfort guarantee and offers delivery to the room of your choice with packaging removal and recycling available. These policies do help to soften the risk of investing at this level.
Who it suits This is an excellent choice if you are a back and side sleeper who wants a mattress that feels indulgent on top but unwaveringly supportive underneath. The medium firm rating, the zoned Medical Grade foam and the high spring count all work in your favour if you are concerned about keeping your back happy without sacrificing comfort.
Couples who have different sleeping positions or who are fed up with feeling each other move should also have this on their shortlist. The dual-layer springs, deep foam and PostureCells design do a good job of isolating movement while still letting you move freely yourself.
If you like the idea of a slightly warmer, cocooning mattress rather than a cool, almost bouncy one, the Healthpro Ultra is likely to hit the spot. That gentle build-up of warmth from the foam felt very pleasant to me, and I can imagine it being blissful on cold nights.
Finally, it suits buyers who are comfortable paying a premium for long-term peace of mind and health credentials. The UK manufacture, independent accreditations, partnership with the Chartered Society of Physiotherapy and the 10 year guarantee all combine to make this feel more like a long-term wellbeing purchase than a basic bedroom buy.
Who it does not suit If you are a very hot sleeper or you live in a consistently warm home, you might find the Healthpro Ultra a bit too insulating. Despite the airflow channels and performance fabric, it still has a generously thick foam comfort layer that naturally runs warmer than a very breathable, natural-fibre mattress.
Front sleepers, especially those on the lighter side, may be better off on something a little firmer overall. While the zoned foam and springs do a decent job of holding the hips up, the plush top and warming foam will not appeal to everyone who prefers a flatter, more rigid feel.
It is also not the right pick if you are working to a strict budget. Mammoth sits firmly in the premium bracket and the Healthpro Ultra reflects that. If you simply need an adequate spare-room mattress or something for occasional use, this is likely to be overkill both in price and in specification.
Lastly, the 33 cm depth will not suit every frame or linen set. If you have a very shallow bed frame, a low headboard, or a collection of standard-depth fitted sheets you do not want to replace, you may find the practicalities frustrating.
Final verdict The Mammoth Healthpro Ultra feels every inch the premium, health-focused hybrid it claims to be. It offers a luxurious, deeply cushioned top that gently warms and moulds around you, paired with a sophisticated support system underneath that keeps your spine well looked after whether you sleep on your back or your side. The edge support is decent, motion transfer is nicely controlled and the overall sense is of a mattress built to do a serious job for the long term.
The trade-offs are clear. It is a heavy, deep and expensive mattress that will not be right for hot sleepers or anyone who simply prefers a cool, ultra-buoyant feel. But if you already like Mammoth's approach, you enjoy that cosy memory foam warmth and you are prepared to pay for clinical credentials and a long guarantee, the Healthpro Ultra is a very easy mattress to fall in love with. For many back and side sleepers, it will feel like a properly premium upgrade that you notice every time you get into bed.
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