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Proudly made in our Australian Factory

10-Year Warranty

Covers you against faulty workmanship and materials

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Certified safe fabric, free from harmful chemicals.

Opal Ultra Firm King Mattress

Name: Opal Ultra Firm King Mattress
Brand: Original Mattress Factory Australia
SKU: AUMATUFKGOPAXXX
Price: 2398.00 AUD
Availability: InStock

Opal Ultra Firm King Mattress

$2,398

$2,398 ~~$2,398~~

Sale Sold out

Taxes included. Shipping calculated at checkout.

Ultra-premium firm mattress delivering uncompromising support and refined comfort, crafted with world-class materials for enduring, restorative sleep.

Feel

Size

Availability

Available for Pre Order

Check Delivery Fees & Pickup Locations

YOUR NEAREST STORE

In Store

Available to try in-store

Free pickup available

Delivery

Available to order

Our team will call within 1 business day to book your delivery

View full details

The Opal Mattress is proudly Australian Made, delivering exceptional comfort and support with a premium sleep system designed for lasting performance.

The 5 Zone Pocket Spring System provides targeted support to promote optimal spinal alignment, while the Track Edge Support System enhances edge-to-edge stability and maximises the usable sleep surface. Available in Soft, Medium, and Ultra Firm feels, and in Double, Queen, and King sizes, the Opal Mattress is designed to help you wake up feeling refreshed, supported, and ready for the day ahead.

Feature	Benefit
Gel Infused Visco Peel Foam	Cooling memory foam contours to the body while helping regulate sleep temperature.
Soft Convoluted Foam	Egg-crate profile improves airflow and creates a plush, pressure-relieving sleep surface.
Firm Comfort Foam Layers	A combination of Firm Feel Foam, Firm Peel Foam, and Firm Sheet Foam provides enhanced support and long-lasting durability.
5 Zone Pocket Spring System	Five targeted support zones help promote spinal alignment while individually wrapped pocket springs minimise partner disturbance.
Track Edge System	Provides superior edge support and keeps you sleeping flat without that rolling out feel.
Premium Quilted Construction	Fabric Layer, Polywool Fibre, Gusset Top Fabric, and Firm Sheet Foam combine for lasting comfort, breathability, and durability.
10-Year Warranty	Backed by a 10-year warranty for long-term peace of mind and confidence in quality.

Mattress Size	Dimensions (L × W × H)	Weight
Double	L 188 cm × W 137 cm × H 26 cm	35 kg
Queen	L 203 cm × W 153 cm × H 26 cm	39 kg
King	L 203 cm × W 183 cm × H 26 cm	44 kg

European Micro Tencel Stretch Knit Fabric

Enjoy the soft, breathable, and moisture-wicking properties of Micro Tencel fabric for a cool and refreshing night’s sleep.

Euro Top Design for Comfort and Breathability

The Euro Top layer enhances airflow and provides added cushioning, ensuring both comfort and durability for long-lasting performance.

Body Flex Micro Coil Small Pocket Coils

Strategically placed under the quilted layers, these micro coils deliver adaptive support, contouring to your body for precision pressure relief and balanced comfort.

Gel-Infused Visco Comfort Layer

Stay cool and comfortable as this gel-infused foam dissipates heat and conforms to your body, offering relief for pressure points and improved sleep quality.

Natural Latex Comfort Layers

Durable, responsive, and naturally breathable, latex layers provide exceptional support and resilience for a sleep surface that feels fresh and supportive every night.

5-Zone Spring Air® High Coil Count Pocket Springs

Engineered with up to 70% Australian Iron Ore, these high-coil-count pocket springs offer zoned support, ensuring proper spinal alignment and minimal partner disturbance.

Full Foam Encasement for Edge-to-Edge Support

Maximize your sleeping surface with edge-to-edge support that prevents sagging, ensures durability, and delivers a consistent sleep experience across the mattress.

Foam Comfort Layers

Additional foam layers enhance cushioning, providing subtle comfort while maintaining the ultra-firm support required for superior posture alignment.

Ultra-Firm Comfort Feel

Designed for sleepers who need the highest level of support, the Saint Kitts delivers firm, structured comfort that promotes spinal health and reduces pressure.

CertiPUR-US Certified Foams

Sleep safer with foams that are free from harmful chemicals, ensuring an environmentally friendly and healthier sleeping environment for your home.

Fabric Meets OEKO-TEX® Standard 100

Hypoallergenic and safe for sensitive skin, this certified fabric guarantees a clean, skin-friendly surface for uninterrupted, healthy sleep.

Mattress Profile Height: 36cm

Dimensions: (L x W cm)

Queen - 203 x 153cm
King - 203 x 183cm

Base sold separately.

Free In-Store Pickup:
Pick up your purchase from one of our 50+ stores across Australia. Once your order is ready, our team will contact you to arrange a convenient pickup time. Find your nearest store using the 'Find My Store' section above or click here.

Home Delivery:
Experience convenient delivery to your room of choice. Delivery fees start at $99 and vary depending on your location. Mattress unpacking and bed base assembly are included where applicable (leg attachment only).

Read our delivery policy here

If you’re not fully satisfied with your new mattress after giving it a fair try, you may exchange it for another comfort level or model within our range.

To be eligible for OMF’s 30-Night Comfort Guarantee, you must purchase a waterproof mattress protector along with your new mattress.

This guarantee is subject to the following terms:

You must sleep on your mattress for at least 14 nights before requesting an exchange.
Mattresses that are damaged or soiled (beyond fair wear and tear) will not be accepted.
The guarantee does not apply to floor/display models and special sizes.
If you choose a higher-priced mattress, you’ll need to pay the difference. No refunds or credits apply for lower-priced exchanges.
Only one exchange is permitted per purchase.
If a Comfort Exchange is approved, a standard fee of $95 will apply to cover administrative costs of this service. Additional delivery and/or collection fees may also apply.

For full details, learn more at our 30-Night Comfort Exchange page

The Opal Mattress is proudly Australian Made, delivering exceptional comfort and support with a premium sleep system designed for lasting performance.

The 5 Zone Pocket Spring System provides targeted support to promote optimal spinal alignment, while the Track Edge Support System enhances edge-to-edge stability and maximises the usable sleep surface. Available in Soft, Medium, and Ultra Firm feels, and in Double, Queen, and King sizes, the Opal Mattress is designed to help you wake up feeling refreshed, supported, and ready for the day ahead.

Feature	Benefit
Gel Infused Visco Peel Foam	Cooling memory foam contours to the body while helping regulate sleep temperature.
Soft Convoluted Foam	Egg-crate profile improves airflow and creates a plush, pressure-relieving sleep surface.
Firm Comfort Foam Layers	A combination of Firm Feel Foam, Firm Peel Foam, and Firm Sheet Foam provides enhanced support and long-lasting durability.
5 Zone Pocket Spring System	Five targeted support zones help promote spinal alignment while individually wrapped pocket springs minimise partner disturbance.
Track Edge System	Provides superior edge support and keeps you sleeping flat without that rolling out feel.
Premium Quilted Construction	Fabric Layer, Polywool Fibre, Gusset Top Fabric, and Firm Sheet Foam combine for lasting comfort, breathability, and durability.
10-Year Warranty	Backed by a 10-year warranty for long-term peace of mind and confidence in quality.

Mattress Size	Dimensions (L × W × H)	Weight
Double	L 188 cm × W 137 cm × H 26 cm	35 kg
Queen	L 203 cm × W 153 cm × H 26 cm	39 kg
King	L 203 cm × W 183 cm × H 26 cm	44 kg

Free In-Store Pickup:
Pick up your purchase from one of our 50+ stores across Australia. Once your order is ready, our team will contact you to arrange a convenient pickup time. Find your nearest store using the 'Find My Store' section above or click here.

Home Delivery:
Experience convenient delivery to your room of choice. Delivery fees start at $99 and vary depending on your location. Mattress unpacking and bed base assembly are included where applicable (leg attachment only).

Read our delivery policy here

If you’re not fully satisfied with your new mattress after giving it a fair try, you may exchange it for another comfort level or model within our range.

To be eligible for OMF’s 30-Night Comfort Guarantee, you must purchase a waterproof mattress protector along with your new mattress.

This guarantee is subject to the following terms:

You must sleep on your mattress for at least 14 nights before requesting an exchange.
Mattresses that are damaged or soiled (beyond fair wear and tear) will not be accepted.
The guarantee does not apply to floor/display models and special sizes.
If you choose a higher-priced mattress, you’ll need to pay the difference. No refunds or credits apply for lower-priced exchanges.
Only one exchange is permitted per purchase.
If a Comfort Exchange is approved, a standard fee of $95 will apply to cover administrative costs of this service. Additional delivery and/or collection fees may also apply.

For full details, learn more at our 30-Night Comfort Exchange page

Mattress Feel

Ultra-Firm

Ideal for stomach sleepers & those needing maximum spinal support

Ultra-Firm Firm Medium-Firm Medium Medium-Soft Soft Ultra-Soft

1 2 3 4 5 6 7

Ergonomic Support