Demko™ Organic Mattress – ExtraLuxe C

Extra-Firm Support with Gentle Cushioning. This mattress combines a solid coir fibre core with one layer of organic latex on each side—adding a touch of softness without compromising its extra-firm feel. Ideal for those who prefer a resilient, supportive sleep surface with minimal yield.

Firmness: 9 / 10 

Layer composition: 3 cm organic latex + 10 cm organic coir fibre + 6 cm organic coir fibre + 3 cm organic latex

Total thickness: 23.5 cm / 9,2″ (including 1.5 cm cover)

Weight support: Up to 140 kg (19 stones) per person, per side

No Adhesives. 100% Organic. Fully Customizable.

We never use adhesives to bond the layers of our mattresses—preserving their purity and ensuring they remain truly organic. This thoughtful design also allows you to rearrange the layers to customize firmness levels, tailoring comfort to your unique preferences within a single mattress.

Layer composition:

  • Top layer: 3 cm organic latex
  • 2nd layer: 10 cm organic coir fibre
  • 3rd layer: 6 cm organic coir fibre
  • Base layer: 3 cm organic latex

Firmness options:

  • 9.0 / 10 

1st rearranged option

  • Top layer: 3 cm organic latex
  • 2nd layer: 10 cm organic coir fibre
  • 3rd layer:3 cm organic latex 
  • Bottom layer: 6 cm organic coir fibre

Firmness options:

  • 8.5 / 10 

2nd rearranged option

  • Top layer: 3 cm organic latex
  • 2nd layer: 6 cm organic coir fibre
  • 3rd layer:3 cm organic latex 
  • Bottom layer: 10 cm organic coir fibre

Firmness options:

  • 8.0 / 10 

3rd rearranged option

  • Top layer: 3 cm organic latex
  • 2nd layer: 3 cm organic late
  • 3rd layer: 6 cm organic coir fibre
  • Bottom layer: 10 cm organic coir fibre

Firmness options:

  • 7.0 / 10 

GOTS-Certified Organic Mattress Cover

Experience the natural luxury of our certified organic mattress cover, thoughtfully crafted to elevate comfort, purity, and performance.

  • Organic Merino Wool: Soft, silky, and GOTS-certified, this premium wool layer offers exceptional breathability and comfort. Naturally hypoallergenic and dust mite resistant, it is also a powerful thermoregulator—keeping you cool in summer and warm in winter. Durable, sustainable, wool supports deep, uninterrupted rest. 

  • Organic Cotton: Also GOTS-certified, our organic cotton adds a smooth, breathable surface that completes the cover with elegance and durability.

Together, these materials create a clean, chemical-free sleep environment that supports your well-being and reflects our commitment to sustainability. It’s the perfect complement to your organic mattress—gentle on your skin, kind to the planet, and built to last. Wool and cotton are biodegradable, renewable, and eco-friendly — this mattress cover is a responsible choice for conscious consumers.

 

Vegan Mattress Cover with Actipro™ Probiotic Protection

Our mattress features a dual-layer cover system designed for purity, performance, and long-lasting freshness.

  • Inner Cotton Layer: A soft, breathable cotton cover protects the mattress core, ensuring structural integrity and comfort.

  • Outer Tencel™ Cover: Made from responsibly sourced wood pulp, Tencel™ is a natural fiber known for its strength, silky softness, and exceptional moisture management. The knitted surface enhances airflow, helping your mattress stay cool and fresh night after night.

Actipro™ Technology: Natural Defense for a Healthier Sleep

Infused into the Tencel™ fabric, Actipro™ is a probiotic-based treatment that provides safe, effective protection against allergens, dust mites, and odors—without compromising beneficial microflora.

  • Uses active probiotics to naturally inhibit harmful bacteria and allergens

  • Applied using natural clay technology for long-lasting performance

  • A gentle, non-toxic solution ideal for sensitive skin and wellness-focused households

This advanced cover system combines nature’s finest fibers with innovative probiotic science—delivering a cleaner, cooler, and more healthful sleep environment.

Important information

All our organic mattresses are GOLS and GOTS certified.

Organic mattresses need to be used on an appropriate, strong, supportive slat base which is able to hold the mattress’ and its users’ weight without becoming hollow. Gaps should be around 2 inches wide. Gaps are needed to help the mattress ‘breath’. This applies to all types of organic mattresses.

All our mattresses comply with BS7177 and BS5852, low hazard domestic use and medium hazard hotel use.

Care instructions for our mattresses

Our mattresses are two sided and you can use both sides. The side with the big product sticker attached to the cover is normally the top.

Take extreme care whilst moving the mattress as the latex can tear if grabbed or pulled on corners or edges.

Rotate the mattress from top to bottom and flip it over once every 3 months in the first 2 years. Then once a year, which will ensure even wear and tear and will prolong its lifespan.

You can air the mattress every time you change your bed linen to keep it fresh and dry.

Never use detergents or chemical cleaners on your mattress. This can adversely affect not only the fabrics but also the fillings inside.

The mattress must be kept dry. If there is a risk of accidents with fluids, please use a waterproof mattress protector.

If you spill something on your mattress and it gets wet, wipe the liquid with a cloth, remove the cover and air the mattress core till it is dry. 

Our covers are zip-off removable and washable by hand wash at 20 maximum at 30 degrees. Do not wash the cover at a higher temperature as it may shrink. Do not tumble dry and do not dry clean it.

The mattress can not be used on boarded, closed or not adequately ventilated bed bases or on the floor as the lack of ventilation may lead to mould and mildew build up and invalidates your guarantee. We recommend slatted bases. The gaps between the slats should be between 2 and 4 inches wide.

The mattress is designed for sleeping on and constant sitting on the edge can cause damage and place undue stress on this area of the mattress.

Please keep packaging away from children. 

We are rated excellent by our customers.

SargamExtremely happy with my recently bought…

Verified buyer

Extremely happy with my recently bought Demko ExtraLure C and A mattresses. After many years and trying all types of mattresses I finally found the perfect mattress for me. It is organic and very comfortable. My neck pain has vanished after sleeping on it from last few weeks now. Also the service is very prompt. Initially I thought the delivery will take several weeks but on request this was made available faster. Product and services both are excellent. I would strongly recommend Demko mattresses to anyone who values and loves their good night sleep.
Anirudha RajguruExcellent product!!

Verified buyer

Excellent product took away my back pain. Also good people to deal with. Highly recommended.
CustomerVery Pleased With Our Organic Demko Mattress

Verified buyer

It was very important for me to have an organic mattress. I was a little nervous to buy a mattress online, but then I figured, you can't really tell much from lying on a bed for a few minutes in a showroom either. Tamas was very responsive and helped direct us toward the best mattress for our needs. We are very happy with the purchase and sleeping peacefully.
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