Construction & materials
This is a combination, or hybrid, mattress, so you are getting both pocket springs and foam at work together. At its core is Silentnight’s Mirapocket zoned support system, a layered network of individually wrapped springs arranged in zones so that the mattress can firm up under your hips and lower back while easing off under your shoulders and legs. That zoned layout is designed to distribute your weight more evenly and help support your posture, and in practice it gives the mattress a very stable, balanced feel.
Above the springs is Silentnight’s Support Memory Cool foam. This is their own take on memory foam, infused with graphite to help draw heat away from the body. The aim is to keep the classic slow-moulding, pressure-relieving memory feel, but make it a touch cooler and a bit more responsive when you move around. The reality of that is pretty much bang on: the foam gently cradles joints and curves, but you do not feel quite as stuck in it as you can on denser, older-style memory foams.
Everything is wrapped up in an advanced box top, so instead of a simple flat panel across the mattress surface you have a visually defined top section that feels like an ultra-plush, permanent topper. It is covered in Silentnight’s CoolEase fabric, a cool-touch material designed to pull heat away from the skin, which is another bonus if you struggle to drift off on warm nights. It gives the mattress a clean, modern look, and a genuinely plush surface the moment you first sink down.
The overall effect is of a deep, solid mattress with enough clever engineering hidden away to make that higher price tag feel justifiable. You are not just paying for a thick slab of foam here, you are paying for a layered system that is designed to marry the best of contouring comfort with good, zoned support.
Firmness & feel
The support level on this model is a true medium. Now, that is actually rarer than you might think these days, as many manufacturers quietly nudge everything towards medium firm, because it is just a bit easier to market as supportive even when in reality it feels a bit board-like. This Silentnight sits bang in the middle: soft and cushioned on top, but with a definite sense of pushback from the springs once you settle in.
Side sleeping, my first impression was of that classic memory foam sink, but a touch quicker and a touch cooler. My shoulder and hip sank in enough to avoid any sharp pressure points building up, but I never got the sense of being swallowed up. The springs catch you quite early and stop you disappearing too far into the box top. For side sleepers, that is almost exactly what you are looking for, especially if you get pins and needles in the arms or sore hips on firmer beds.
On my back, the zoned Mirapocket core does a decent job of keeping the lower back supported, without that feeling of disappearing into a bog. You still get a cosy, enveloping feel from the foam layer, but if you tune in you can feel a firmer band running through the centre of the mattress that is holding the spine in a more neutral line. It is not a rock-solid, orthopaedic type of feel, but it is a lot more supportive than the soft, pillowy top might suggest.
Stomach sleepers are the only group I would be slightly cautious with, and then only if you are lighter to average in build and like a soft, cushioned feel. If you are heavier or already struggle with lower-back niggles, you may be better off with something in the medium firm or firm range, just to stop the hips dropping too far.
Performance & support
Support-wise, the Silentnight SleepResponse Support 3600 is quietly impressive. The Mirapocket system is built to respond individually to movement, which means when you roll from your side onto your back, you do not drag a big dip of mattress along with you. The surface settles quickly and you can feel the springs working independently under different parts of the body.
Pressure relief is a real strong point. The graphite-infused memory foam takes the edge off knees, hips and shoulders without that mushy feeling. When I lay in a typical side-sleeper position for several minutes, I could feel my shoulder dipping nicely into the box top, while the mid-section of the mattress stayed firm. There was no sense of my torso sliding downhill or spine bending into a U-shape, which can be a problem with cheaper all-foam beds.
Motion isolation is very good for a spring mattress. Pocket springs already do a decent job of containing movement to one side of the bed, but once you add a dense foam comfort layer on top you really get a very calm surface. If you share with a partner who tosses and turns, or who gets in later than you, this will be kinder than a bouncier open-coil or very springy hybrid.
Edge support is respectable, but you do still get that bit of compression you expect from a box-top design. Sitting right on the edge to put socks on, I sank right through the top section before hitting the firmer support of the springs. Lying close to the edge felt secure, but if you regularly perch right on the rim of the bed you might notice a little more roll-off compared with a full, foam-encapsulated edge.
Temperature regulation
Silentnight has clearly gone after the warm sleeper with this mattress, and there is a fair amount of cooling tech layered into the design. The Support Memory Cool foam uses graphite to draw heat away from the body, and the CoolEase cover is designed to move warmth away from the surface as you settle.
In practice, the top feels pleasantly neutral when you first get into bed, rather than immediately warm. As you lie there, you do feel the usual memory foam cocooning effect, but it never got into that stuck in a hot groove sensation that some older memory foam beds can suffer from. I would still describe it as a warm and cosy mattress, not a crisp, super-cool, hotel-style pocket-sprung feel, but for a foam-topped hybrid it is very well controlled.
Personally, I have always felt good gel foams solved most of the overheating issue a decade ago, and this graphite approach is Silentnight’s way of putting their own spin on the same theme. It is not a gimmick, but equally it will not turn a very hot sleeper into a cool one overnight. If you know you run extremely hot, you may still want to pair it with lighter bedding and a breathable protector.
Practical features
This is an exclusive model to Dreams, which means if you buy it you are buying into all their other products and service. A 100-night comfort guarantee, finance options if you want to spread the cost, old mattress recycling and free weekday delivery, all of which take some of the hassle out of a premium purchase.
The mattress arrives as a full-depth unit, not rolled, so you will want delivery into the room and ideally a second pair of hands if you are manoeuvring it around tight corners. It is a heavy, substantial piece, which is reassuring from a quality point of view but also means you should consider how often you realistically want to rotate it in future.
As with most box-top hybrids, you should treat this as a no-turn mattress, in that you do not flip it over. But you should rotate it head to toe, weekly for the first three months and then monthly after that, to even out settlement in the comfort layers. Doing that from day one usually pays off in a more consistent feel over the long run.
Silentnight as a brand is one of the big, established UK names in beds, with a strong reputation for being mainstream reliable rather than boutique experimental. That, plus the fact the SleepResponse collection is only available via a major national retailer, does give you a bit of peace of mind if you are a bit wary about buying from a lesser-known online-only brand.
Who the Silentnight SleepResponse Support 3600 suits
First, it is a very good fit for classic side sleepers who want cushioning without losing support. The true medium tension, combined with that deep box top, allows shoulders and hips to nestle in so you are not fighting the mattress, but the zoned Mirapocket core keeps your spine aligned and stops you sinking into a hammock shape.
It should also appeal to lighter and average-build back sleepers who like a bit of plushness. If you find firm orthopaedic mattresses too unforgiving, but still care about proper lumbar support, this strikes a nice middle ground.
Couples who are easily disturbed by movement will appreciate the way the springs and memory foam work together. There is minimal bounce transfer, so if one of you is restless and the other sleeps like a log, both should be reasonably content.
Finally, it is a strong option if you love the feel of memory foam but have hesitated because of overheating. The combination of graphite-infused foam and a cooling cover will not magically make the mattress cold, but it does take the edge off the warmth and make it more comfortable for those who sleep slightly on the warm side.
Who it will not suit
If you are a heavier back or stomach sleeper who needs something properly firm, this will likely feel too soft over time. The top is deliberately cushioned, and although the springs underneath are supportive, the overall feel is still medium, not firm or very firm.
Ultra-hot sleepers who already struggle in foam beds may want to be cautious. The temperature control here is good for a foam-topped hybrid, but at heart this is still a memory-style mattress. If you want the freshest, coolest possible surface, a latex hybrid or a more traditional pocket-sprung mattress with a thinner, fibre-based comfort layer might be a better fit.
If you are shopping on a tight budget, the price will also be a sticking point. With larger sizes sitting in the premium bracket, this is very much a considered purchase. There are more basic Silentnight pocket-spring and combination mattresses that deliver a similar underlying feel for less, just without the fancy box top and latest cooling foam.
Lastly, if you prefer a very bouncy, on the mattress feel, this will not be for you. The SleepResponse Support 3600 is about gentle, enveloping comfort with controlled springiness, not the lively, trampoline note you get from some more traditional pocket-sprung designs.
Final verdict
The Silentnight SleepResponse Support 3600 Combination Mattress feels like a confident, grown-up hybrid for people who want memory foam comfort without turning the bed into a sauna. The true medium tension is refreshing in a market that so often defaults to medium firm, and it will suit a broad range of sleepers, especially side sleepers and anyone who likes to feel gently hugged by their mattress rather than pinned on top.
The price is undeniably in the premium bracket, but for what you are getting, a high-spec Mirapocket core, graphite-infused cooling foam, a luxurious box top and the reassurance of a big-name brand sold through a major retailer, it does not feel unreasonable. Having tried it in store, I came away thinking that while Silentnight is not reinventing the wheel here, they have put together a very comfortable, very liveable mattress that most people will get on with straight away.
If you want a supportive, medium-feel hybrid from a brand you can trust, and you are happy to pay for that extra layer of comfort and cooling tech, the SleepResponse Support 3600 is well worth serious consideration.
