A natural mattress uses fillings that come from plants or animals, such as wool, cotton and natural latex, in place of synthetic foam. That sounds simple, but "natural" has no legal definition in the UK, so two mattresses with the same label can be built very differently. This guide explains the materials, the labels and what to check before you buy.
Quick answer: A natural mattress replaces foam comfort layers with fibres such as wool, cotton or natural latex, usually over pocket springs. Wool is the most common choice in the UK because it manages heat and moisture well. "Natural" is not the same as "organic": organic is a certified claim, natural is not. Always ask what each layer is made of.
How we put this guide together
We make and sell mattresses, including one wool mattress, so treat our product pick as exactly that. The explanations of materials and labels apply to any brand, and we say clearly what our own mattress is and is not.
What is a natural mattress?
There is no official standard a mattress has to meet to be called natural. In practice the term is used for mattresses whose comfort layers (the part you feel) are made from natural fibres instead of polyurethane or memory foam.
Almost no mattress is natural all the way through. Pocket springs are steel, threads and spring pockets are often synthetic, and every mattress sold in the UK has to meet fire safety rules. A fair description is usually "natural fillings over a sprung core".
That is why the useful question is not "is it natural?" but "which layers are natural, and what are the others made of?"
Natural, organic, non-toxic: what the labels mean
These terms are used as if they were interchangeable. They are not.
| Label | What it means | Is it verified? |
|---|---|---|
| Natural | Some or all fillings come from plants or animals | No. It is a description, not a standard |
| Organic | Fibres grown and processed to a certified organic standard | Yes, if it carries a certificate such as GOTS or GOLS |
| Non-toxic or chemical-free | Usually means no added chemical fire retardants or certain treatments | No fixed definition. Ask exactly what is excluded |
| Eco or sustainable | Can refer to materials, recycling or manufacturing | Varies. Look for the specific claim behind it |
For textiles, the main organic certificate is the Global Organic Textile Standard (GOTS). Its "organic" grade requires at least 95% certified organic fibres, and "made with organic materials" requires at least 70%. If a mattress is sold as organic, ask to see the certificate.
The main natural mattress materials
Wool
Wool is the most widely used natural filling in UK mattresses. The fibres absorb moisture vapour and release it again, which helps keep the sleeping surface dry and at an even temperature. It gives a cushioned, slightly springy feel, firmer than memory foam.
Wool also chars instead of melting when exposed to flame, which is one reason mattress makers use it close to the surface.
Cotton
Cotton is soft and breathable and is used in covers and as padding. It compresses more than wool over time, so it is normally layered with other fibres and not used on its own.
Natural latex
Natural latex is made from rubber tree sap. It is the bounciest natural material and the closest in feel to foam, with more push-back and less sink. Check the wording: "latex" on its own can mean synthetic or blended latex. We compare the two in our guide to latex vs memory foam.
Cashmere, mohair and horsehair
These appear in premium handmade mattresses, usually in small amounts blended with wool. Horsehair is springy and airy, and cashmere and mohair add softness. They raise the price considerably.
Coir and other plant fibres
Coir (coconut husk fibre), flax and hemp are used as firm insulating pads between the springs and the softer layers. You do not feel them directly, but they stop the fillings working down into the springs.
A note on bamboo
Bamboo mattress fabric is nearly always bamboo viscose. The plant is natural, but turning it into soft fibre is a chemical process. It makes a comfortable, breathable cover, but it is a stretch to call a foam mattress natural because of a bamboo cover.
Natural fillings vs foam: how they compare
| Natural fibre mattress | Foam or foam hybrid mattress | |
|---|---|---|
| Feel | Cushioned and supportive. You sleep on it, not in it | Contouring. Moulds closely around the body |
| Temperature | Fibres let air and moisture move through | Depends on the foam. Open-cell and gel foams are cooler than traditional memory foam |
| Pressure relief | Good, with a firmer surface feel | Very good, especially for side sleepers |
| Care | Fillings settle, so rotate regularly | Usually rotate only |
| Price | Higher. Natural fibres and hand finishing cost more | Wide range, including lower-cost options |
Neither is better for everyone. If you like the close hug of memory foam, a natural fibre mattress will feel different, and a foam hybrid mattress may suit you more. Our guide to mattress comfort layers explains how each material behaves.
Are wool mattresses a good choice?
For many sleepers, yes. Wool suits you if:
- You sleep warm. Wool moves moisture away from the body, which is what makes a bed feel clammy. See our guide to the best cooling mattresses for other options.
- You prefer a supportive surface. Wool cushions without letting you sink.
- You want fewer synthetic materials in your bed. Wool replaces the foam comfort layer.
It may not suit you if you want deep, slow-moulding pressure relief, or if you know you are sensitive to wool.
On allergies: a drier sleeping surface is a less welcoming place for dust mites, which is why wool is often recommended to allergy sufferers. No mattress filling removes allergens on its own, so a washable protector and regular cleaning still matter. Our guide to the best mattress for allergies goes into more detail.
Do natural mattresses contain fire retardants?
Every mattress sold in the UK must meet the Furniture and Furnishings (Fire) (Safety) Regulations 1988. How a mattress meets them varies.
Some use chemically treated fabrics or fillings. Others rely on materials that resist ignition without added treatment, and wool is the best-known example. "Natural" on the label does not tell you which approach was used, so if this matters to you, ask the maker directly how the mattress passes.
Our natural mattress: the Natural Lux
The Natural Lux is the one mattress in our range that uses wool instead of foam for its comfort layers. It won Best Mattress in the Expert Reviews Sleep Awards 2026.
Natural Lux Hybrid Mattress
Hampshire wool comfort layers over 1000 full-height pocket springs. Medium-firm (7/10), 28cm deep, handmade in the UK. Expert Reviews Best Mattress 2026.
Shop the Natural Lux✓ 100-night trial ✓ 15-year guarantee ✓ Free UK delivery ✓ 0% finance
What it is:
- Hampshire wool comfort layers in place of foam, for breathability and moisture control.
- 1000 full-height pocket springs that move independently, for zoned support and less partner disturbance.
- Hand side-stitched edges that hold the fillings in place and keep the edge firm.
- A tuft-free sleeping surface, so there are no buttons to feel through the cover.
- Non-turn. Rotate it head to foot every few months.
- Seven sizes, from small single to super king.
What it is not: it is not certified organic, and like any pocket sprung mattress it has a steel spring core. We describe it as a natural fibre mattress, which is the accurate term.
The 100-night home trial matters more than usual here, because wool feels different from foam. The trial extends to up to 200 nights when you add a protector to your order.
What to check before you buy a natural mattress
- The full list of layers. Ask what every layer is made of, not only the headline material.
- How much natural filling there is. A thin wool layer over foam is not the same as wool comfort layers throughout.
- Certificates for any organic claim. GOTS for textiles, GOLS for latex.
- How it meets fire regulations. Treated fabric, or naturally resistant materials.
- Spring type and count. Pocket springs give better support and less movement transfer than open coil.
- Turning and rotating. Some natural mattresses need flipping. Non-turn models only need rotating.
- Trial and guarantee. Natural mattresses feel different, so a home trial reduces the risk.
Looking after a natural mattress
Natural fillings settle in the first few weeks as the fibres bed down. This is normal, and our guide to mattress settlement explains what to expect.
- Rotate the mattress as the maker recommends, more often in the first few months.
- Use a breathable protector. A cotton-faced protector keeps the natural feel while guarding against spills.
- Air the bed. Pull the duvet back for a while each morning so moisture can escape.
- Use a supportive base. Wide gaps between slats let fillings sag.
Natural mattress FAQs
What is the most natural mattress?
The most natural mattresses use only plant and animal fibres, such as wool, cotton, coir and natural latex, with certified organic materials and no synthetic foam. They are usually handmade and expensive. Most natural mattresses combine natural fillings with a steel pocket spring core.
What is the difference between a natural and an organic mattress?
Natural describes where the materials come from. Organic is a certified claim about how they were grown and processed. A mattress can be natural without being organic. If it is sold as organic, it should carry a certificate such as GOTS.
What is the healthiest type of mattress?
There is no single healthiest type. The right mattress is one that keeps your spine level, suits your sleeping position and stays comfortable through the night. Natural fibres can help if you sleep hot or prefer fewer synthetic materials. If you have a medical condition that affects your sleep, speak to your GP.
Are wool mattresses good for hot sleepers?
Yes, in most cases. Wool absorbs and releases moisture, which helps the sleeping surface stay dry and at a steadier temperature than dense foam. It will not feel cold to the touch, but it is less likely to feel clammy.
Are natural mattresses worth the money?
They cost more because natural fibres and hand finishing are more expensive than foam. They are worth it if you value breathability, a supportive feel and fewer synthetic materials. If you prefer the contouring of memory foam, a foam hybrid will give you more of what you like for less.
