Millbrook Wool Luxury 4000 Pocket Mattress
Mattress
Millbrook Wool Luxury 4000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
28
Layers
5
Layer Details
- Cover. A soft-touch cotton-viscose fabric infused with M-Pure, a 100% natural, plant-based treatment. It's naturally fire resistant, which means no added chemical fire retardants in the cover.
- Comfort fillings. Luxury Hampshire fleece wool blended with layers of English cotton, traditionally hand-tufted. Wool and cotton breathe well, so this layer helps keep you at a steadier temperature through the night.
- Mini pocket springs. Small, individually cased springs sit near the surface to add comfort and soothing pressure relief. They respond to your shape more precisely than fillings alone would.
- Pocket spring support system. 4000 pocket springs zoned in 7 areas, an arrangement Millbrook calls ErgoZone 7. Each spring is individually encased and adapts to your movement, which means support that follows your body rather than the whole bed dipping.
- Edge support. Metal rods sit above and below the spring unit, held in place with butterfly clips. This reinforces the edges, so you can use the full width of the mattress without the sides sagging.
Layer details from mattressonline.co.uk product page, September 2026.
- Room for two, space to walk around: At 135cm wide, this size fits a typical UK bedroom with bedside tables on both sides, where a UK king can crowd the room.
- 67.5cm each when you share: Two people get 67.5cm each of individually pocketed springs, which means one partner turning over is less likely to disturb the other.
- Usable right to the edge: Metal rod edge reinforcement matters more in a shared size, letting both of you sleep near the sides without rolling towards the middle.
- Cool across a shared bed: Two bodies raise the temperature under the duvet, and the Hampshire wool and cotton fillings breathe far better than foam does.
- Easy to dress and replace bedding: Standard double sheets and a 200 x 200cm duvet fit, stocked everywhere at every price point.
This size suits you if...
You share the bed every night and want the traditional couples' size without giving your whole room over to the mattress, or you sleep alone and like space to spread out, perhaps with a cat or dog claiming a corner. It also suits a guest room that hosts visiting couples, where the natural fillings and steady medium firm feel will please most people passing through.
Consider another size if...
You and your partner both like space, your room is at least 2.7m x 2.9m, and you find 67.5cm each a little tight. We'd recommend the UK king instead, which is 15cm wider and 10cm longer.
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Is the Millbrook Wool Luxury 4000 double big enough for two adults?
For most couples, yes. You get 67.5cm each across the 135cm width, and the 4000 zoned pocket springs support each of you independently, so movement transfer is low. Broader sleepers, or restless ones, may prefer the UK king, which gives 75cm each. If your room allows it, that extra width is worth having.
What room size do I need for the Millbrook Wool Luxury 4000 in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves walking space on both sides and room for bedside tables. The double is often the sensible pick in older terraces and standard new build bedrooms, where a UK king would leave the room feeling cramped.
Is the double version of this mattress hard to get upstairs?
It deserves some planning. This is a traditionally built pocket spring mattress with dense natural fillings, so it's heavy, and at 135 x 190cm it won't fold or roll like boxed foam. Turning stairs in older terraces and tight new build landings are the usual pinch points, so measure your route before delivery day. The turning handles help once it's in place.
Would a UK double or UK king suit a couple better in this mattress?
It comes down to your room. The UK double is 15cm narrower and 10cm shorter than the UK king, and suits rooms from 2.6m x 2.8m. If you have at least 2.7m x 2.9m and either of you is tall or a sprawler, the UK king gives 7.5cm more each and is the better long-term buy.
Is this size a good choice for a guest room?
Yes, it's arguably the ideal guest room size, since it accommodates visiting couples and solo guests alike within a footprint that still leaves room for a wardrobe and drawers. The medium firm feel suits back and front sleepers, which covers most visitors, though lightweight side sleepers may find it slightly too solid.