Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Obasan organic Grand mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
Grand Custom Organic Mattress
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Grand Custom Organic Mattress

$4,319
Sold out
$4,319
Sold out

The Grand Custom Organic Mattress is the pinnacle of Obasan comfort and craftsmanship. Built with 12 inches of GOLS-certified organic latex and a 3.5-inch organic topper, it delivers a deeply cushioned, cloud-like feel with exceptional support and adaptability for all sleep styles.

Available exclusively through consultation

The Grand Custom Organic Mattress is the most advanced expression of Obasan’s modular sleep system. With increased height, additional layers, and a deeply immersive comfort profile, it’s designed for those seeking the highest level of adaptability, pressure relief, and personalized support.

Product variants
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Ultimate Customization : Our most advanced modular system allows precision adjustments throughout the mattress.
Includes Grand Organic Topper : A removable 3.5" organic wool and latex topper delivers unmatched plushness.
Deep Comfort Profile : Expanded layer height enhances pressure relief, motion isolation, and body contouring.

The Grand Custom Organic Mattress represents the pinnacle of Obasan’s craftsmanship, customization, and unmatched comfort.

Built with 12 inches of pressure-relieving GOLS-certified organic latex and finished with a luxuriously thick 3.5-inch organic topper, the Grand offers a deeply cushioned, cloud-like sleep experience without compromising support.

The Grand’s added depth and layers allows for exceptional adaptability across body types, sleep positions, and comfort preferences. The expanded profile enhances pressure-point relief, improves motion isolation, and creates a sense of weightless relaxation night after night.

Designed for sleepers who want nothing less than the most immersive organic sleep system available

Sleepers who want the ultimate cloud-like sleep system with increased height and layers.

For best performance, your Obasan mattress should be placed on a firm, supportive foundation with built-in breathability, such as wooden slats or a ventilated platform base. See our Obasan Foundations.

Slatted Base/Foundation

We recommend a slatted mattress base or foundation with:

  • Metal or wooden slats spaced no more than 3” apart
  • Slats that are  2” - 6” wide
  • A centre support bar running vertically down the middle of the frame
  • One or more centre legs to further support the centre beam. This becomes especially helpful for larger mattresses (Queen, King, or California King).

Solid Wood Base/Foundation

If your foundation has a solid wood surface, it must include ventilation for airflow. We recommend: 

  • Vent holes approximately 1” in diameter
  • Spaced about 12-15” apart

Please ensure it has holes or vents for recommended breathability. We typically recommend holes of about 1" diameter every 12-15" apart.

*** Please refer to our diagram in the product images for visuals.

Need Help Choosing a Base?

If you have any questions about the ideal support for your mattress please do not hesitate to contact us. We’re happy to help ensure and confirm your setup provides the safest and most appropriate support.
  • GOLS-certified organic latex
    Provides resilient, pressure-relieving support with long-term durability.
  • GOTS-certified organic cotton
    Breathable and soft, promoting airflow and surface comfort.
  • GOTS-certified organic wool
    Naturally moisture-wicking and temperature regulating for balanced sleep.

See our GOTS Certification
See our GOLS Certification

Mattress Height: 12 inches
Topper Height: 3.5 inches
Total Profile: 15.5 inches
—
Twin (39” x 75”) Weight :approx. 103 lbs.
Twin XL (39” x 80”) Weight :approx. 118 lbs.
Double (54” x 75”) Weight :approx. 151 lbs.
Queen (60” x 80”) Weight :approx. 194 lbs.
King (76” x 80”) Weight :approx. 254 lbs.
California King (72” x 84”) Weight :approx. 254 lbs.

Mattress Care:

  • Flip the first two layers every 6 months to extend the lifespan of your mattress. Alternate the rotation each time: first rotation head to toe, next rotation left to right, and continue alternating.
  • Removable mattress cover can be aired out seasonally, if necessary.
  • Do not wash any components of your mattress. If necessary, spot clean with a mild soap and very little water. Air dry.
  • Do not place mattress layers in direct sunlight or direct heat source.
  • In order for your mattress to breathe properly, we recommend placing your mattress on an Obasan Foundation or an equivalent solid wood slat base. If you’re unsure if your foundation will work, one of our Sleep Experts would be happy to help you. https://obasan.ca/pages/contact-us

Topper (Included) Care:

  • Please open the topper within 30 days of receiving the product. 
  • Do not allow the topper to get wet.
  • Do not wash any components.
  • For spot cleaning, gently scrub with a light soap and very little water. Air dry.
  • Do not place in direct sunlight or direct heat source.
  • Flip or rotate the topper every 2–4 weeks, alternating rotation each time: first rotation head to toe, next rotation left to right, and continue alternating.
  • It's important to note that the topper will conform to the surface it is placed on. If there are any indentations on your mattress, the topper will also adopt the same contours.
  • 20-year limited warranty: First 10 years non-prorated. Second 10 years prorated from day one.
  • Final sale product with a 180 comfort guarantee.
  • Shipping is free* on orders of $400 and over within continental Canada and the USA.**
  • We primarily ship via FedEx. In cases where FedEx service is not available in your location, we use a reliable third-party carrier.
  • A local pickup option is also available at checkout. 
  • White glove service may be available in your area. Contact us for more information.
  • Returns are accepted on unopened products only.
  • Handmade in Ottawa, Canada

Please review our Policies Page for details on how to start a return.

*Please note: Foundations are subject to a flat shipping fee of $250 CAD in Canada and $400 USD in the USA.
**Additional fees may apply for remote locations. Contact us for more information.


How your product will be shipped
Please note that if your order contains additional products, this information may change. Weights are approximate and may vary slightly.

Twin, Twin XL : 2 Boxes
Double, Queen, King, Cal.King: 4 Boxes

Click here to get more information on the weight and dimensions of the boxes.

Designed with environmental responsibility at every stage:

  • Certified organic materials
  • No petroleum-based foams
  • No chemical flame retardants
  • Carbon-neutral Canadian manufacturing

Features

Ultimate Customization

An expanded take on our modular multi-zone system allows fine-tuned adjustments at the shoulders, hips, and legs for balanced alignment and personalized comfort.

Support For Every Sleeper

Tailored just for you, your side of the mattress is personalized to fit your body type, sleep position, and unique support needs.

Includes Removable 3.5” Organic Wool Topper

Our thickest topper offers unparalleled plushness while maintaining responsive support and gently aligning the body.

Naturally Breathable Design

Certified organic latex, wool, and cotton work together to promote airflow, regulate moisture, and maintain a comfortable sleep temperature year-round.

Made From Durable Materials

High-quality organic latex is naturally resilient, helping the mattress maintain its shape, support, and performance over time.

Zero Off-Gassing

Crafted without synthetic foams, adhesives, or chemical flame retardants for clean, odor-free sleep from the first night.
The Obasan Difference

Made by Hand, With Care You Can Feel

At Obasan, our promise begins with you. We believe true care goes beyond the products we make. It’s about listening, guiding, and supporting you at every step of your sleep journey. With honesty and transparency, we create a space where you feel heard and valued.

Every product, every stitch is made with your comfort, health, and peace of mind at heart. For us, sustainability means caring for our planet and sustaining the trust and well-being of every person we serve.

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Personal Support, Every Step of the Way

Read All FAQs

The Grand Mattress, like all Obasan products, is made from GOLS-certified organic latex, GOTS-certified organic cotton, and GOTS-certified organic wool. These natural materials provide resilience, pressure relief, and temperature regulation while ensuring responsive support, durability, and a sustainable, chemical-free sleep environment. Learn more about why we use organic materials →

The Grand Mattress is fully customizable and built to order, so it requires a consultation with one of our Sleep Experts. Because there are four latex layers that are tailored to your body type, sleep position, and comfort preferences, it’s too complex to configure and purchase directly online.

The Grand Mattress features our ultimate customization experience, allowing complete customization at the shoulders, spine, and legs. With four layers of responsive latex, each zone can be fine-tuned to balance alignment and support, giving you a fully personalized sleep experience that adapts to your body and sleeping style.

Yes. The Grand Mattress can be customized on each side, allowing couples to have different comfort levels, support preferences, or firmness zones to sleep soundly while sharing the same mattress.

Yes. The Grand Mattress’s inner layers are completely accessible by peeling back the mattress encasement. Simply unzip the mattress cover, peel it back, and adjust or flip the layers as needed. We recommend flipping and rotating the layers once every six months to maximize your mattress’ lifespan. For best results, we also recommend contacting one of our sleep specialists during the adjustment process to ensure proper alignment and ergonomics.

With proper care, including adhering to the care instructions and rotating and flipping the mattress layers every 6 months, the Grand Mattress is built to last for decades. It comes with a 20-year limited warranty (first 10 years non-prorated, second 10 years prorated), reflecting its durable, high-quality materials.

The Grand is Obasan’s most advanced mattress, featuring an expanded 12-inch latex core with a 3.5-inch removable wool topper. It offers deeper layers, enhanced pressure relief, motion isolation, and full multi-zone customization for every sleeper. Its modular design and organic materials make it the pinnacle of adaptability, comfort, and sustainable craftsmanship. Take a look at our mattress Comparison Tool to learn more.
EDUCATION

Discover Our Commitment to Enhancing Your Sleep Naturally

Learn how organic materials, thoughtful design, and Canadian craftsmanship come together to support healthier sleep for your child and your home.