Natural Mattress Fillings Explained: Wool, Latex, Cotton, and More

Natural mattresses have moved from niche to mainstream — and for good reason. If you spend a third of your life on a mattress, the materials inside it matter. Natural fillings offer real advantages: they tend to breathe better, last longer, and avoid the synthetic foams and chemical treatments found in conventional mattresses.

But "natural" covers a wide range of materials, each with different properties. Here's what actually differentiates them — and which ones are worth prioritizing based on how you sleep.

Why Choose Natural Mattress Fillings?

Natural fillings aren't just an environmental choice — they have functional advantages for sleep:

• Better temperature regulation — many natural fibers breathe more effectively than synthetic foam, keeping you cooler in summer and warmer in winter
• Lower off-gassing — synthetic foams can release VOCs (volatile organic compounds) when new; natural materials typically don't
• Longer lifespan — materials like latex, wool, and horsehair are highly durable and maintain their properties longer than standard poly foam
• Naturally hypoallergenic — many natural materials inherently resist dust mites, mold, and mildew without chemical treatments
• Sustainability — most natural fillings are renewable and biodegradable

The tradeoff: natural mattresses typically cost more than conventional foam options. Whether the premium is worth it depends on how long you plan to keep the mattress and your specific sleep needs.

Wool

What it is

Wool is one of the oldest mattress materials and one of the best-performing natural fillings. Used as a comfort layer in many organic mattresses, it provides cushioning while regulating temperature and moisture.

How it performs

• Temperature regulation: Excellent. Wool wicks moisture away from the body and regulates heat effectively — cooler in summer, warmer in winter.
• Durability: High. Wool fibers are resilient and spring back over time.
• Allergy resistance: Good. Wool naturally resists dust mites and mold due to its moisture management. It is not hypoallergenic for those with wool allergies, however.
• Flame resistance: Naturally flame-resistant without chemical treatment — this is why most organic mattresses use wool as their fire barrier.

Best for

Hot sleepers, cold sleepers, anyone who wants natural temperature regulation, and those looking for a certified organic mattress.

Organic Cotton

What it is

Cotton is used in mattress covers and as a comfort filling. Organic cotton (GOTS-certified) is grown without synthetic pesticides or fertilizers.

How it performs

• Feel: Soft and familiar — cotton has a gentle, breathable surface feel.
• Breathability: Good, though not as strong as wool for moisture wicking.
• Durability: Moderate. Cotton compresses over time more than wool or latex.
• Allergy resistance: Organic cotton avoids pesticide residues that can be present in conventionally grown cotton.

Best for

People sensitive to chemicals in conventional mattresses, those who prefer a soft, natural surface feel, and anyone shopping for a GOTS-certified organic mattress.

Natural Latex

What it is

Natural latex is harvested from the sap of rubber trees. It's one of the most durable and high-performing natural mattress materials available. Available in two forms: Dunlop (denser, heavier, firmer) and Talalay (lighter, more consistent, slightly softer).

How it performs

• Support: Excellent. Latex is responsive and pushes back against body weight — unlike memory foam, it doesn't let you sink in deeply.
• Pressure relief: Good to excellent, depending on ILD (firmness) rating.
• Durability: Among the highest of any mattress material. Natural latex mattresses commonly last 15–20 years.
• Temperature: Sleeps cooler than memory foam; natural latex has an open-cell structure that allows airflow.
• Hypoallergenic: Naturally resistant to dust mites, mold, and mildew. Note: those with latex allergies should avoid this material.

Best for

Sleepers who dislike the sinking feel of memory foam, those with back pain who need responsive support, and anyone prioritizing longevity. Browse our latex mattress collection.

Bamboo

What it is

Bamboo fibers are used primarily in mattress covers and as a soft comfort fill in some mattresses. Bamboo grows rapidly and is considered a sustainable crop.

How it performs

• Cooling: Good. Bamboo fabric is naturally moisture-wicking and feels cool to the touch.
• Softness: Very soft — bamboo fabric has a silky feel.
• Antimicrobial: Bamboo has inherent antimicrobial properties, though processing into fabric can reduce these. Look for "bamboo linen" for better retention of these properties.
• Durability as a filling: Moderate — bamboo fiber compresses more than latex or wool over time.

Best for

Hot sleepers who want a soft, cool surface. Most effective as a cover material or top comfort layer rather than a primary support filling.

Hemp

What it is

Hemp fiber is used in some eco-mattresses as a durable, breathable filling layer. Hemp grows rapidly with minimal water and no pesticides.

How it performs

• Durability: High. Hemp fiber is one of the strongest natural fibers and softens gradually with use.
• Breathability: Good. Hemp allows airflow and manages moisture reasonably well.
• Feel: Firmer and slightly coarser initially; becomes softer over time.
• Sustainability: Excellent. Hemp requires little water and no synthetic inputs to grow.

Best for

Those who prioritize environmental sustainability and longevity. Often used in combination with other natural fillings rather than alone.

Coconut Coir

What it is

Coconut coir is made from the fibrous husks of coconuts — a byproduct of the coconut industry. It's used as a firm, supportive layer in some organic and natural mattresses.

How it performs

• Firmness: High. Coir is a firm, dense material — it provides structure rather than cushioning.
• Durability: Good, especially when encased in natural rubber (which is common).
• Breathability: Good. Coconut coir has a naturally open structure.
• Sustainability: Excellent — it's a waste byproduct of coconut processing.

Best for

Back and stomach sleepers who prefer a firm surface, and those who want a non-synthetic support layer in an organic mattress build.

Horsehair

What it is

Horsehair has been used in high-end mattresses for centuries. It's used in traditional European handmade mattresses and some premium brands as a comfort layer.

How it performs

• Feel: Springy and responsive — unlike dense fillings, horsehair has a lively, bouncy feel.
• Durability: Exceptional. Horsehair mattresses last decades with proper care.
• Breathability: Excellent. The hollow structure of horsehair allows significant airflow.
• Cost: Significantly more expensive than other natural fillings.

Best for

Those investing in a premium, heirloom-quality mattress. Horsehair is most common in luxury handmade mattresses. Ensure it's ethically sourced.

Silk

What it is

Silk is sometimes used as a luxury comfort layer in premium natural mattresses. It provides a smooth, temperature-regulating surface with hypoallergenic properties.

How it performs

• Feel: Extremely smooth and soft.
• Temperature regulation: Good — silk absorbs moisture and stays comfortable across a range of temperatures.
• Hypoallergenic: Naturally resistant to dust mites.
• Durability as a filling: Moderate — silk is delicate and less durable than wool or latex as a primary filling material.

Best for

Luxury mattress buyers who want a premium feel and natural materials. Best as a top comfort layer rather than a core filling.

Natural Fillings at a Glance

Shopping for a Natural Mattress in LA

At LA Mattress Store, we carry a selection of organic and natural mattresses as well as natural latex options that you can test in person at any of our five showrooms. Our team can walk you through what's inside each mattress and help you match the right combination of natural materials to your comfort preferences and sleep style.

We also offer flexible financing and a 120-night comfort guarantee on qualifying purchases.

Frequently Asked Questions

Are natural mattresses better than foam mattresses?

Not categorically — it depends on your priorities. Natural mattresses tend to sleep cooler, last longer, and off-gas less than synthetic foam. But quality matters more than the "natural" label. A well-made hybrid with quality foam layers will outperform a poorly constructed natural mattress.

Can natural mattress fillings help with temperature regulation?

Yes — wool and latex are especially effective at managing heat and moisture. Wool actively wicks moisture away from the body, while latex's open-cell structure allows airflow. Both outperform standard polyurethane foam for temperature regulation.

Are natural mattresses good for allergies?

Many are. Latex, wool, and silk naturally resist dust mites and mold. Organic cotton and GOTS-certified materials avoid pesticide residues. If you have a latex allergy, avoid latex; if you have a wool sensitivity, choose cotton or bamboo.

How long do natural mattresses last?

Natural latex mattresses often last 15–20 years. Wool and cotton comfort layers compress over time but can sometimes be restored. Horsehair mattresses, when well-made, can last generations.

What certifications should I look for?

GOLS (Global Organic Latex Standard) for latex, GOTS (Global Organic Textile Standard) for cotton and wool, OEKO-TEX for any fabric components. These confirm the materials are what the brand claims and free of harmful substances.

What's the difference between Dunlop and Talalay latex?

Both are natural latex but made using different processes. Dunlop latex is denser and firmer — good for support layers. Talalay latex is lighter and more consistent in feel — typically used in comfort layers. Many mattresses use both.