Emma Performance 30 Mattress Review UK 2026

A note from James, who actually slept on it

Lead tester · 86kg / 13st 8lb · hot sleeper · back/side combo · former Silentnight QC

Quick verdict for UK buyers

Tallest Emma you can buy in a box. You are not buying a new spring system versus the 26 or 28. You are buying thicker foam so a side-sleeper shoulder has more room to disappear before the zoned core takes over. We score it 4.2/5 — not 5 — because the extra 4cm versus the 26 is real, but it is also 4cm of fitted-sheet drama, a heavier rotate, and a sleeping surface kids have to climb. Value is the missing point, not rounding error. The 4.2 is a household average: Sarah at 62kg scored the hug 4.5 and still doubted the ticket; David at 104kg scored it 3.6 and wanted the 26. I am 86kg. My 4.0 is the middle, not a stand-in for either of them.

Emma’s from-price is about £999 versus £729 for the 26 and £799 for the 28. Tom’s Guide’s July 2026 RRP snapshot put a double at £1,599. Those deltas are the review. If you cannot name a reason you need max sink — wide shoulders, a history of bottoming out, a genuine preference for a deep hotel profile — buy the 26 and keep the difference.

Bottom line: broad-shouldered side sleeper, wait for the sale, budget for 40cm sheets. Everyone else — look at the 26, or stay in Original with Elite, and stop treating height as a personality.

Who the Performance 30 is for

Should you buy the Performance 30?

Why 30cm is not a new mattress

Emma’s three Performance pages recycle the same seven-layer tour. The FAQ is the useful spec. Shared stack: improved AirGrid Tech, dual MemoryAdapt, zoned pocket springs. The 26 / 28 / 30 difference is how thick two layers run. On this model MemoryAdapt is 4.5cm and SupportBase is 6.5cm. That is 4cm more combined foam in those two layers than the 26 (2cm + 5cm), and 2cm more than the 28 (3.5cm + 5.5cm).

You are not buying a secret eighth cooling layer. You are buying travel. A broader shoulder has more foam to disappear into before the spring core says stop. AirGrid still rebounds when you turn — it is a grid, not ThermoSync graphite, not Original Pro’s hugging foam. The 30 does not change that. It stacks more cushion underneath it.

That is also why diminishing returns are the whole argument. Lighter sleepers may never load the extra 4.5cm of firmer MemoryAdapt. Heavier side sleepers are the ones who can actually use it and notice the 26 was a bit short. If you cannot feel the difference in the first fortnight, you bought height, not comfort. Use the trial like an adult.

Physics, not adjectives: more foam plus more mass equals more travel before the zoned core. Sarah at 62kg / 9st 11lb sits on the light end of that equation — she may finally get the hug she missed on the 26, or she still finds a tall expensive bed she does not fully compress. David at 104kg / 16st 5lb sits on the other end. The same 4.5cm + 6.5cm cradle that saves a broad shoulder becomes a hotel pillow-top he did not ask for. I am 86kg, between them. I felt a bit more hotel. I did not feel a jammed-shoulder fix. That is why the 30 exists for one body and is a thickness tax for another.

Three nights from the test bedroom

North-facing spare room, no AC, UK duvet, a typical wooden frame that already sat a bit high. Not a lab. That is the point.

Who slept on it (including the one who called it a tax)

Five bodies, one 30cm stack. James Wright is the lead at 86kg / 13st 8lb — not the heavy tester. David Patel is 104kg / 16st 5lb. Sarah Mitchell is 62kg / 9st 11lb. That 42kg gap is why the same deepest cradle in the Performance range (4.5cm MemoryAdapt + 6.5cm SupportBase) can be a hug and a hotel pillow-top on the same week.

The case against the Performance 30

We give it 4.2/5. The missing points are not rounding errors. Sarah at 62kg scored the hug 4.5 and still questioned the ticket. David at 104kg scored it 3.6. That spread is the missing points.

1. You may not need max sink. Emma built this for broader shoulders. Average-build side sleepers, lighter people, back sleepers, anyone who already likes a 26cm hybrid — you will pay for foam you cannot load. I am in that group at 86kg. Sarah at 62kg liked the hotel sink and still was not sure she used the extra 4cm. David at 104kg loaded every millimetre and over-sank. Rachel at 68kg, broader-shouldered side, is not in that skip group. Be honest about which one you are before you order the tallest box.
2. Budget for the sheets. 30cm plus a protector wants a 40cm pocket, 45cm if you like a thick one. The 35cm “extra deep” packs from a 25–27cm mattress will ping off. Standard 25cm hotel sheets will not last a night. Add that cost to the from-price. A free bundle duvet does not put the corners back on.
3. Value versus the 26 is the whole review. Same improved AirGrid, same 7 zones, same 200-night trial. Emma’s from-prices: 26 at £729, this at £999. Tom’s Guide had a double RRP at £1,599. You are shopping 4cm of MemoryAdapt and SupportBase. If that 4cm is not a problem you can name, you are buying a taller bed for kids to climb.

Pros and cons

How we scored it

Weighting follows our published method: comfort and support first, then cooling, motion, edges, durability and value. Value is marked down because the 30 is a thickness upgrade, not a different mattress family. I marked it at 86kg. David at 104kg / 16st 5lb would have marked it harder — he called the extra ticket a thickness tax. Sarah at 62kg scored comfort high and still doubted she loaded the extra 4cm.

What 30 centimetres actually is

Top to bottom, this is the stack you sleep on. Emma lists seven layers. The two that make this the 30 — not the 26 — are the thicker MemoryAdapt and SupportBase.

If you liked Elite’s float but wanted more pillow-top, this is the closest Emma currently sells — at a higher ticket, without Elite’s magazine paper trail. Do not buy it because the word Performance is on the box.

Firmness: height is the brand’s scale

Emma does not print a 2/5 sticker on Performance the way it does on Original Elite. It uses height as the firmness story: taller means plusher and more enveloping. I landed at about 5/10 — a plush-medium. You get a longer travel through MemoryAdapt and SupportBase than on the 26, then a springy stop. It should not feel like slow, sticky memory foam; the grid still rebounds when you turn.

Lighter sleepers may never use the extra 4.5cm of firmer MemoryAdapt. Heavier side sleepers are the ones who can actually load that foam. That is the diminishing-returns argument in one sentence. Sarah at 62kg / 9st 11lb is the light-end test: hotel sink, 4.5 score, still unsure she used the extra 4cm. David at 104kg / 16st 5lb is the heavy-end test: more foam plus more mass equals more travel, and on his back that travel was a pillow-top he had not asked for. Which? has not tested this mattress, so there is no independent softness score to quote.

Sleep positions and body weight

Emma has not published a per-side kilogram limit on the Performance 30 page the way some Original spec sheets do. If you are a very heavy sleeper, the thicker SupportBase is theoretically helpful; the plusher surface is not automatically “more supportive.” On David’s 104kg back it just meant more foam to fall through before the core. Use the trial.

Body weight is not a vibe. It is how far you travel through the comfort layer before the core holds you. Sarah at 62kg / 9st 11lb often needs a softer top so her shoulder can drop. David at 104kg / 16st 5lb often needs that same top to stop sooner, or his hips make a hammock. James at 86kg / 13st 8lb sits between them — useful as a typical UK male, useless as a stand-in for a 104kg back sleeper. If you are shopping this Emma Performance 30 because a review said “medium-firm,” match the kilogram figure nearest yours, not the brand icon.

Tester	Weight	Fit	What that weight actually did
Sarah Mitchell	62kg / 9st 11lb	Mixed	Hotel sink she scored 4.5 for. At 62kg she may finally get the hug she missed on the 26 — or she still sleeps on a tall expensive bed she does not fully load. She was not sure she used the extra 4cm.
James Wright	86kg / 13st 8lb	Mixed	86kg, back/side, lead reviewer — not the heavy tester. Extra travel was pleasant, not a revelation. He did not keep a 30cm climb for a sink he barely used.
Emma Thompson	71kg / 11st 2lb	Mixed	71kg side-dominant. Enough mass to feel the extra MemoryAdapt; too much hotel for someone who wanted the 28. Also the one who clocked the 40cm-sheet problem in thirty seconds.
Rachel Adams	68kg / 10st 10lb	Strong	68kg, broader-shouldered side. This is the model if a thinner hybrid leaves the shoulder jammed. Front sleeping still dumps the hips — she would send those buyers to the 26.
David Patel	104kg / 16st 5lb	Poor	104kg on his back. More foam plus more mass = more travel. The 4.5cm + 6.5cm stack became a hotel pillow-top he did not ask for. Edges better than frameless Emmas; still a thickness tax at £999.

Find yourself on the scale

Use these bands as a first filter, then use the trial. They are how this mattress behaved for our panel, not a medical chart. A 95kg side sleeper is not David, and a 70kg stomach sleeper is not Sarah.

Your weight	Fit on this mattress	Read this first
Under ~70kg, side	Mixed	Sarah’s band at 62kg. You may finally get the hug the 26 withheld, or you may sleep on a tall expensive bed you never fully load. Trial the price gap, not just the sink.
~70–90kg, mixed or back	Mixed	James’s band at 86kg. The extra 4cm is real. It is also 4cm of sheets, weight and climb. Most people here should still start at the 26.
~70–90kg, broad-shoulder side	Strong	Rachel’s case. Extra MemoryAdapt is shoulder room. This is why 30cm exists. Emma Thompson at 71kg felt the foam and still preferred 28 — so be honest about how much hug you actually want.
~95–110kg, back	Poor	David’s 104kg night. You will use every millimetre of the comfort stack, which on this height means over-sink, not “more support”. Start at the 26.
Stomach, any listed weight	Skip	Emma points all-position and stomach-friendly buyers at the 26. Hips drop into 6.5cm of SupportBase. Rachel would send you there too.

This brand does not print a useful per-side kilogram limit on the product page we used. Treat David’s 104kg week as a comfort signal, not a lab certificate, and use the home trial if you are in his weight class.

Couples with a large weight gap should read Sarah at 62kg and David at 104kg as the two ends of this mattress. They are 42kg apart. On the deepest Performance cradle the lighter partner often gets the hug; the heavier partner on their back often gets the crater. One 30cm stack cannot run two firmnesses. Use the trial as the product. More on matching firmness to body type: firmness by sleep position.

Cooling: cover claims versus Original Pro

Performance marketing leans on three things: open AirGrid Tech, a breathable core, and a cool-to-touch cover. That is passive airflow, not Pro’s ThermoSync graphite. Emma’s only numbered claim I found is that the Performance 26 showed a 72% higher capacity to level out temperature spikes than a full-foam mattress — manufacturer testing, asterisk attached, and not a 30cm result. Thicker foam on the 30 does not automatically make that number better; more foam can also store more heat if the grid and cover do not keep up.

I will not treat this as Which? “Very cold.” That band belongs to Original AirGrid testing, not this collection. I slept reasonably on it in a Manchester room with no AC. It did not stew me the way cheap memory foam does. It also did not feel like a cheat code. Emma Thompson at 71kg / 11st 2lb is the temperature veto — mid-weight, so if she cooks it is the mattress adding heat, not just her duvet. She did not stew, and she still did not want this height. If you already like Pro’s hugging graphite, do not assume a 30cm knit cover is colder. If you hate graphite cling and want a grid plus a cool-hand fabric, you have a coherent story — still one you prove at home over 200 nights.

Couples, edges, the boring admin

Motion: I barely noticed a partner get up. Independently wrapped zoned springs plus a thick comfort stack is a classic couples recipe. Emma says partner movement is reduced. We have no magazine motion score for the 30. Usable for a restless partner, not silent like a dense all-foam block. The 200-night trial is the honest test if one of you is a hair-trigger sleeper.

Edges: Performance adds a foam frame around the spring unit. That is a real construction difference versus many older Emma hybrids that relied on edge-to-edge springs alone. Sitting to tie shoes still compresses 30cm of foam; you will not get Hypnos-divan rigidity. You should get less of a slide-off than a frameless pillow-top. David at 104kg / 16st 5lb still shrugged — his sitting-edge mornings are why we put him on the panel — and on his back the extra foam was a crater, not a rail. Until a lab publishes an edge test, treat Emma’s “guarantees stability” line as a design intent, not a measured result. Rotate it, do not flip it. Unbox with two people. Buy from Emma if you want Emma’s trial.

Unboxing a 30cm hybrid (this is not a 22cm Lite)

You are not slicing tape on a guest-room Lite. A recovered Performance 30 is a hotel-depth slab. Emma still ships it compressed, but the moment the plastic is off you have a tall, awkward, heavy object that wants a bed frame, not a bedroom carpet. Two adults. Clear the route from hall to frame first — including the height of any ottoman lid you have to lift it over. Emma’s own FAQ tells you to check the frame can take the weight before you install it. Take that warning seriously.

Give it a full 24 hours to reach height before you call it “too thin” or wrestle extra-deep sheets onto half-square corners. Emma also says to air the room for up to 72 hours for the new-mattress smell. A 30cm stack is more foam and grid to off-gas than a thin hybrid. Open a window. Do not sleep on it the afternoon you cut the wrap and then decide the trial failed.

First-week practicalities the Lite reviews never have to mention: kids and shorter adults will notice the climb; pets may need a stool; rotating head-to-toe through a typical UK door is a planned manoeuvre, not a Sunday stretch. If that paragraph already feels like too much faff, you do not want this height. You want the 26.

Bed base, sheet depth, and how high you will sit

Emma allows slatted bases with gaps no more than 7cm, box springs, platforms and the floor. Wider slats let a zoned core sag between bars. An old sprung divan that already dips will become part of the feel. Adjustable bases are not named on the Performance 30 page; a quality frame with close slats can work if the motor is rated for a significantly heavy mattress. A budget adjustable is a gamble — use the trial.

Sheets: 30cm of mattress plus a protector is a 40cm-pocket job. 45cm if you like a thick protector. The 35cm extra-deep sets that work on a 27cm Elite will ping off these corners. Standard 25cm “hotel” sheets will not last a night. Add that cost to the from-price before you congratulate yourself on a bundle duvet.

Sleeping height: a typical UK wooden frame or ottoman plus 30cm of mattress can put the sleeping surface well over 60–70cm from the floor. Fine in a tall bedroom. Miserable if children climb in, if you have knee issues, or if you already raised the bed for under-bed drawers. Measure the frame, add 30cm, then stand next to a kitchen worktop (usually ~90cm) and be honest.

UK buying details: trial, warranty, delivery

Emma remains largely online in the UK. You will not reliably lie on a Performance 30 in a high-street bed shop. The trial is the showroom.

200 nights vs Nectar’s 365: does the longer trial win?

This is the tab most people have open next to Emma Performance 30. Nectar advertises a full year and a warranty with “forever” in the name. Emma advertises 200 nights and ten years. The terms are not the same thing, so here they are next to each other before the marketing gets to you.

How the small print actually works, across every UK brand: UK mattress trials and returns explained.

UK sizes and prices (August 2026)

Emma listed the Performance 30 from £999 including VAT on the product and collection pages when we checked. That from-price is the highest in Emma’s current mattress line-up. Tom’s Guide recorded July 2026 RRPs and a summer sale; both move. Treat the table as a snapshot, not a promise. Do not pay full RRP.

Prices last checked 19 August 2026. Emma’s live from-price was £999. No UK small double on the Performance pages we reviewed. Confirm centimetres if you have a continental frame. Shop bundles (pillows, protector, duvet, pillowcases “worth up to £478”) are promotions on the collection page — not mattress layers. The 26 was running a similar extras offer at a lower claimed value; do not pick the 30 for free bedding.

Comparisons

If you want the whole UK range on one page — including which model we would actually buy — start on which Emma should I buy?. Spend-up vs Elite: Elite vs Performance

Performance 30 vs 26 vs 28

Same improved AirGrid, same 7 zones, same trial. You are shopping foam thickness and bedroom practicality. The 26 is the Performance I would tell most people to order — including David at 104kg on his back, and me at 86kg. The 28 is the compromise. The 30 is for people who already know they want the deepest sink — Rachel’s jammed shoulder, not Sarah’s 62kg maybe-hug — and will live with the height.

Performance 30 vs Original Elite

Full spend-up call — Elite versus 26/28/30, when 30 is a thickness tax: Emma Elite vs Performance.

I kept the Elite in the test bedroom. I did not keep this. Elite is the documented AirGrid hybrid with a lower typical ticket and 3cm less height. Performance 30 is the newer, taller, more expensive experiment. If you want proof from Which? or GHI, Elite still has the paper. If you want maximum Emma sink and will pay for it, the 30 is the model — not a renamed Elite.

Full Elite write-up: Emma Original Elite review.

Performance 30 vs the rest of the 30cm-plus class

Comparing a 30cm Emma to a 28cm Simba is not a like-for-like. If you have decided you want a genuinely tall mattress, these are the UK beds actually in that class — and this is the one place in the Emma range where the price argument lands in Emma’s favour.

Performance 30 is the cheapest way into this height by £250, on identical trial terms — that is a real, checkable win and the strongest argument the page has. Simba Hybrid Luxe buys you three microspring layers, a UK-made stack and a 4ft size Emma does not sell. Eve Wunderflip Ultimate is the only one of the three where you can change your mind about firmness after the trial ends — for a tall bed you cannot return in year two, that is worth more than £300 to some people. If you want to go taller still, Simba Hybrid Ultra is 34cm from £1,749, and the bedding problem gets worse, not better.

Stepping down instead of across? Simba Hybrid Pro is 28cm from £899 with up to 4,800 Aerocoil — normal-bedding territory, and the bed most people looking at a 30cm Emma should probably buy instead.

Full ranges: Simba, Eve. Depth and dimensions for every UK size: UK mattress sizes explained.

Emma Performance 30 FAQ