Why Do Memory Foam Mattresses Smell?

Written by Nectarsleep Editorial Team

Last updated on Jul 09, 2025

Better Sleep Blog
Why Do Memory Foam Mattresses Smell?

In this article:

(And why it’s not as weird as it seems.)

Let’s set the scene: your brand new mattress has just arrived. You unbox it, it starts expanding, and you’re all set for your first dreamy night’s sleep.

But then—
What’s that smell?

Kind of like new paint? Or maybe nail polish remover? Definitely a bit... chemical-y.

Yep, we’re talking about that classic new memory foam mattress smell. It’s real, it’s common, and the good news is — it doesn’t last forever.

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So what is that smell?

That new mattress smell is caused by something called off-gassing. It happens when the foam releases tiny particles known as volatile organic compounds (VOCs) into the air. These VOCs are a by-product of the manufacturing process, and they’re released once the mattress is unpacked and starts to expand.

Basically, it’s the mattress version of that new car smell.

And while the term “off-gassing” sounds a bit alarming, it’s usually harmless — especially if you’ve bought from a trusted brand.

Is it safe to sleep on?

Yes — especially if you’ve chosen a mattress like Nectar, which is CertiPUR-certified. That means the foam inside meets strict standards for content, emissions, and durability, and is made without things like mercury, lead, formaldehyde, or nasty chemical flame retardants.

So while the smell might be a bit annoying at first, you can rest easy knowing you’re not breathing in anything dodgy.

How long does the smell last?

For most people, that new mattress scent fades within a few hours to a couple of days. Occasionally it can linger for up to a week, especially if the room is small or not well ventilated.
But it will go. Promise.

How To Speed Up Mattress Off Gassing

Here’s what helps:

  • Let it air out – Leave the mattress in a well-ventilated room for 24–72 hours before sleeping on it.

  • Open windows – A good old-fashioned breeze does wonders.

  • Turn on a fan – Get the air circulating to help clear the scent.

  • Use baking soda – Sprinkle a bit on the surface, leave it for an hour, then vacuum it off (great for absorbing odours).

Bottom line?

That new mattress smell is totally normal — and totally temporary. It’s just the foam doing its thing after being rolled and boxed up.

With a CertiPUR-certified mattress like Nectar, you know the materials inside are held to high safety and environmental standards — and that smell is just a sign your brand new mattress is ready to settle into its new home.

So open the windows, pop the kettle on, and give it a little time. Before you know it, you’ll be drifting off on your new cloud of comfort — scent-free and utterly blissed out.

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