Lie on your side and your shoulder props your upper body off the mattress. Your head gets no such lift, so it ends up sitting lower than the rest of you, and your neck spans the difference all night.

On most adults that space is 9 to 12 cm — measure from the point of your shoulder to the side of your head. Broader shoulders, bigger space.

An ordinary pillow has loose filling and no shape of its own. It takes the shape of whatever presses on it, which means it sinks lowest exactly where your head is heaviest — the one place you needed it to hold up.

This one is cut from a single piece of memory foam, and four things are cut into it:

A dip in the centre for the back of your head.
A raised ridge front and back that sits in the space under your neck.
Two wide wings either side, lower than the middle, with a hollow under each one to put your arm in when you sleep on your side.
Two scooped cut-outs at the bottom edge, so the pillow comes down over your shoulder instead of stopping short of it.

There is also a small hole through the centre of the dip. It is there so the foam under your ear is not solid — if you have ever woken with a sore ear from a firm pillow, that is what it is for.

The foam holds all of that under the weight of your head rather than flattening out. That is the whole mechanism; there is nothing else to it.

One pillow, two heights. One face is taller than the other and you simply turn it over.

The 12 cm face — for sleeping on your side, and for broader shoulders. The wider the space between your shoulder and your head, the more height it takes to fill.

The 9 cm face — for sleeping on your back, for narrower shoulders, and for anyone who finds the taller face pushes their chin down toward their chest.

If you move around all night, start on 9 cm. The wings either side mean your head stays on the pillow when you roll rather than sliding off the dip. If you find you are mostly on your side, turn it over.

Nothing to choose at checkout and nothing to send back if you pick wrong — both heights are in the box, because both are in the pillow.

High density memory foam, dark grey. Press it and the dent stays for a moment before filling back in. That slow return is what lets it carry the weight of your head without collapsing. It is firmer than you are expecting, and that is deliberate — a soft contour pillow would squash flat and stop being a contour.

A white quilted cover that zips off. It wraps the base of the pillow and leaves the shaped grey foam exposed on top, which is why the two colours show in the photographs. Cold wash, gentle cycle, hang it to dry. Do not tumble dry it and do not iron it.

The foam core never goes in the machine. It tears and it holds water for days. Spot-clean it with a barely damp cloth if you need to.

Two parts, and that is all there is. No gel layer, no cooling technology, no electronics.

Shape                Contour, central hollow with a raised edge front and back
Heights              12 cm one face, 9 cm the other
Dimensions       64 × 40 cm
Core                   High-density memory foam, one piece
Cover                Ice silk, full-length zip, removable
Cover care        Cold machine wash, gentle cycle, hang dry
Core care          Spot clean only — never machine wash
Colour               Dark grey core, pale cover
Best for            Side and back sleepers
Front sleepers  Use the wings, not the middle — see note 3 below

In the box
The pillow
Its zipped ice silk cover, already on

Not in the box
A spare cover
A pillowcase that fits your other bedding — see note 2 below

It arrives compressed in its packaging and takes a few hours to come back to full shape. Leave it out of the cover while it does.

1. It smells of foam for the first day. New memory foam has a scent when it comes out of the packaging. Unzip the cover, leave the foam out in a room with a window open, and it goes within roughly 24 hours. It is the most common surprise with any foam pillow and we would rather you expected it.

2. Your own pillowcases will not fit. It is 64 × 40 cm and a UK standard pillowcase is 50 × 75 cm, so yours will hang off it and bunch up in the hollow. The zipped cover it comes with is cut to the shape. That is the one to use.

3. Front sleepers: read this before you order. The maker says it suits every position, and the wings either side are lower than the middle, which is where you would lie face-down. That part is true. But the lowest face of this pillow is still 9 cm, and if you currently sleep face-down on something thin or on no pillow at all, this will feel high to you. Our honest read: side and back sleepers are who it is cut for. Front sleepers can make it work, but it is a compromise rather than a fit.

4. It takes a few nights. If you have slept on something soft for years, a firm contour pillow feels wrong at first. Most of the adjusting happens in the first three or four nights. One night is not a fair test, which is exactly why the 60 nights exist.

5. Memory foam sleeps warmer than feathers. That is true of all memory foam and anyone telling you otherwise is selling you something. The ice silk cover is the part that helps, because it is what your face is actually touching.

6. It is not a medical device. It does not treat, cure or manage anything, and we make no claim that it does. It is a pillow cut to a shape that keeps your head roughly level with the rest of you. If you have a neck or back condition, ask your GP or physiotherapist before changing your pillow — not us.

Sleep on it for two months. If it is not for you, write to contact@hiluci.co.uk and we will refund it or replace it, whichever you prefer. No photographs and no explanation needed.

Sixty rather than thirty because a pillow is not something you can judge in a night — your neck needs a few days to stop expecting the old one.

That is on top of your legal right to cancel within 14 days of delivery under the Consumer Contracts Regulations 2013. The sixty nights is simply us giving you longer than the law asks.