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Setup and care
Everything is in the box: the foam, rolled inside its liner, and the cover. Nine steps and the bed is ready. How to wash it is further down.
The roll
Step 1. Lift the roll out of the box.
Step 2. Slide the roll out of its sleeve and unroll it. It opens up as soon as it's out of the sleeve and settles into its full shape over 24 to 48 hours.
The cover
The liner stays on the foam. Only the cover goes on.
Step 3. Take the cover out of the box and unfold it.
Step 4. Unzip it all the way around.
Step 5. Open it flat.
Step 6. Line up the indent in the foam with the indent in the cover, at the mark, and lower the foam in with the elastic edge of the liner facing up. Then work the sides of the cover up and over the foam, a little at a time.
If the cover won't go on, the indents aren't lined up. Lift the foam out and set it in again rather than forcing it.
Step 7. Fold the flap over onto the foam.
Step 8. Zip it closed all the way around.
Step 9. Turn it over and smooth the sides with your hands. That's it.
Washing
The cover and the liner both come off and go in the machine. The foam doesn't. Here's how.
Washing the cover
Machine wash cold on a gentle cycle, zipped closed. No bleach and no fabric softener, because softener coats the fibers and dulls the water-repellent finish. Line dry or dry flat, and let it dry fully before it goes back on, since a damp cover is much harder to fit. No dryer, no iron and no dry cleaning.
Between washes, vacuum everyday dust and hair with an upholstery attachment, and dab spills with a soft cloth rather than rubbing them in.
Putting it back on is the same steps as above, from step 4.
Washing the liner
Machine wash cold and line dry. No bleach, no softener, no dryer, no iron and no dry cleaning. The membrane is the part that does the work, and heat is what damages it.
When it's dry, it goes back on before the cover, then the cover goes on over it.
The liner stretches, but it's a thinner material than the cover, so it needs a gentler hand. Don't pull it by the seam or the edge, and keep nails away from the fabric. Lay it flat, set the foam on it, and ease the edge over the foam a little at a time. If it doesn't want to go, the foam isn't lined up, so take it off and start again rather than forcing it.

The core doesn't get washed
The foam doesn't wash. That's what the cover and the liner are for.
With the liner off you'll see the bare foam. It ranges from white to light yellow, often not evenly, and there may be a thin bond line where the rounded edge meets the core, in clear, white, pink or red. That's the material, and it changes nothing about support. Keep the core out of direct sun while the liner dries, since sunlight deepens the color.
If it does get wet, treat it as urgent. Dry it fully, flat, out of direct sun, with air moving over both faces, before it goes back in the cover.