What arrives#

A roll-pack mattress arrives compressed, vacuum-sealed and rolled into a cylindrical cardboard box. A king-size mattress in a box is typically around 50 cm in diameter and 160 cm long, heavy (25–40 kg for a hybrid) but manageable by one person with a sack truck. It looks remarkably small for a full mattress.

Before you unbox#

  • Move the box to the correct room first, the box is easier to move than a partially expanded mattress
  • Have the bed base in position and the room arranged before opening
  • Get scissors or a box cutter ready
  • Having a second person makes the lifting significantly easier

Step-by-step unboxing#

  1. Open the cardboard box and slide the rolled mattress out
  2. Position it on your bed base in the centre, still rolled, aligned with the bed width
  3. Carefully cut the outer plastic film, the mattress will begin to unroll immediately. Cut shallowly to avoid cutting the mattress cover
  4. Unroll and lay flat on the base
  5. Cut the inner vacuum-seal film, air rushes in and expansion begins immediately
  6. Stand back and let it expand naturally

How long until it's ready?#

Most mattresses reach 80–90% of final size within 2–4 hours and are safe to sleep on after 4–6 hours. Full expansion to the stated depth typically takes 24–72 hours. The new foam smell (off-gassing) dissipates within 24–72 hours with adequate ventilation, open windows during and after unboxing.

If it doesn't expand properly#

If the mattress hasn't reached close to its stated depth after 72 hours in a room-temperature environment, contact customer service. Failure to expand is uncommon but can indicate a quality issue, most brands will replace a defective mattress promptly.

Dealing with the packaging#

A roll-pack generates a surprising amount of waste, and most of it is awkward rather than difficult.

  • The cardboard box is recyclable kerbside once it is flattened. It is large; cut it down rather than trying to fold it.
  • The plastic film is usually LDPE, which most UK councils do not take in household recycling. Larger supermarkets generally accept soft plastics at front-of-store collection points, which is the simplest route.
  • Keep the packaging until you have decided. Not because you will re-roll the mattress - you cannot, it takes industrial equipment - but because some return policies ask for the original box, and because the label on it carries the model and batch details you will need if you ever claim on the guarantee. Photograph the label at minimum.

And the old mattress#

Plan this before the new one arrives, not after. A mattress standing on its end in a hallway is an obstruction, and it will not fit back into the room it came out of once the new bed is made up. If the retailer offers removal, book it for the same delivery slot. If not, most councils run a bulky waste collection for a modest fee, and it usually needs booking a week or two ahead. Our guide on disposing of an old mattress covers the options, including what to do with one that is still in good condition.

The first few nights#

Two things routinely worry people who have never bought a roll-pack, and neither is usually a fault.

It feels firmer than expected. Foam that has been compressed for weeks takes time to regain its full loft, and a mattress at 90% expansion sleeps firmer than the same mattress at 100%. Give it the full 72 hours before forming a view, and the full three to four weeks before deciding it is wrong.

There is a smell. Off-gassing is the release of trapped volatile compounds from new foam, and it is normal. Ventilate the room well, and leave the mattress uncovered for the first few hours. If the smell is still strong after a week, or it gives you headaches, contact the retailer - a persistent odour is worth raising while the trial period is comfortably open. Our guide to mattress off-gassing goes into what the smell is and how long to expect it.

Frequently asked questions#

Can I sleep on it the first night?#

Usually yes. Most roll-packs are safe to sleep on within four to six hours, though they will not be at full depth for one to three days. Sleeping on it early does not damage it - if anything, body weight helps it expand.

Can I stand the box on its end while it expands?#

No. Unroll it flat on the base it will live on, before cutting the vacuum seal. Expanding foam is heavy, floppy and almost impossible to reposition once it has opened, and expanding it vertically can distort the layers.

What if a corner looks dented or uneven?#

Wait the full 72 hours in a warm room. Compressed foam recovers more slowly when it is cold, and a dent that looks permanent on day one has usually gone by day three. If a hollow is still there after that, photograph it and contact the retailer.

Does unboxing it myself affect the trial or guarantee?#

No, that is how these mattresses are designed to be delivered. Cutting into the mattress cover with the box knife, however, is damage rather than a fault - cut the film shallowly, and away from the mattress.