Slily 12 Inch 4ft6 Double Mattress – Hybrid Memory Foam Pocket Sprung, 7-Zone Orthopaedic, Medium-Firm
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Product description
What it is
The Slily 12 Inch Double Mattress is a medium‑firm hybrid mattress designed for balanced support and comfort. Sized at 135x190x30 cm, it combines carbon steel hybrid springs with a high‑density support layer and memory foam to offer a stable yet comfortable sleep surface for most sleeping positions.
How it helps you sleep

On the technical side, each spring is individually encased to contour to your body’s curves and distribute pressure evenly. This aims to keep the spine in a neutral position, reducing common trouble spots in the back, waist and hips. The design also emphasises motion isolation: when a partner moves, the independent springs minimise transfer so you’re less likely to be woken mid‑night.
What stands out and where it might fall short


On the plus side, the combination of pocket springs and memory foam tends to provide a balanced feel—neither too soft nor too hard. It’s described as medium‑firm, which can suit a range of sleepers, including back and side positions. A potential limitation is the time needed for the foam and springs to settle after unboxing, plan for a few days of adjustment before you feel the full effect.

Who it’s for
This mattress is suited to couples who want good motion isolation without sacrificing edge support or overall comfort. If you favour a traditional flat, supportive feel that still cushions pressure points, this hybrid could fit the bill. It’s not pitched as a premium ultra‑premium model, so if you’re chasing the highest level of conforming memory‑foam feel or a noticeably plusher surface, you might want to explore other options.
Who it’s not ideal for

If you prefer a very soft or a very firm surface, this model’s medium‑firm profile may not align with your preference. Also, those who require a quick immediate bounce for activities like frequent turning may notice the hybrid construction feels less springy than a pure innerspring setup.


When it makes sense to buy
Consider this mattress if you want a solid all‑round option that minimises partner disturbance and supports neutral spine alignment. It also suits buyers who appreciate a boxed, vacuum‑sealed delivery that’s easier to manoeuvre through tight hallways and doorways.

What to check before purchasing
- Confirm the double size measurements (135x190x30 cm) fit your bed frame and space.
- Note the unboxing guidance: allow at least 72 hours for the foam and springs to regain shape, plan for a longer period (about four weeks) to fully adjust to the mattress.
- Remember the 100‑night trial mentioned with the product for assurance in case the feel isn’t right after a few weeks.
How it compares to the options you’ll see elsewhere



This model sits between entry‑level and mid‑range hybrids: the combination of individually encased springs and memory foam aims to balance support and pressure relief without veering into a ultra‑soft memory‑foam market or a high‑cost premium pocket‑sprung design. If you’re weighing alternatives, a more traditional sprung mattress may feel firmer with less contouring, while a higher‑end foam‑heavy option could offer more cushioning but less edge stability.
Decision moment: Is it worth it?
If you prioritise a realistic blend of support and comfort with reliable motion isolation, this could be a sensible choice in its category. It’s not the best option if you specifically want a plush foam feel or a very firm surface, in that case, you may wish to consider other models with different firmness profiles.

FAQ
- How long before you can sleep on it comfortably? Allow at least 72 hours for foam and springs to regain shape, full adjustment may take up to four weeks.
- Is it good for back pain relief? The 7‑zone orthopaedic design and evenly distributed pressure aim to support spinal alignment and alleviate common pressure points, though results vary by individual.
- How does it handle movement? Independent encasings minimise motion transfer, which helps if you share the bed.
Technical overview
- Size: 135x190x30 cm (Double)
- Spring system: carbon steel hybrid springs, individually encased
- Comfort layer: memory foam atop a high‑density support layer
- Firmness: Medium‑Firm
- Special features: 7‑zone orthopaedic design, motion isolation, boxed delivery, vacuum sealed
- Delivery note: ships vacuum compressed and boxed, allow expansion time after unboxing
- Trial/guarantee: 100‑night trial offered
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