Fundy Organic Kids Mattress
Fundy Organic Kids Mattress
They Grow Up Mattress
Fundy Organic Kids Mattress
Fundy Organic Kids Mattress

They Grow Up Mattress

$1,290.00 CAD

This Mattress Includes Free In-Home Delivery & Setup in the Calgary & Edmonton Areas & is Cleverly Packaged for Free Courier Shipping Elsewhere in Canada.


Kids grow up, and that usually means you'll have to buy them a new mattress as they get bigger. Not so with our fully certified organic children's mattress.

Part of our Zippered Forever Bed™ collection, They Grow Up features two individual layers of GOLS-certified organic latex, one firm, and one medium. Your little one can start off with the firmer layer on top, and then as they grow up, simply reverse the mattress so that the medium layer is on top.

They Grow Up provides optimum support and comfort for toddlers and children up to a maximum weight of 150 lbs. t•masc mattresses use only breathable materials including moisture-wicking GOTS-certified organic wool for perfect temperature control.

The Fundy's medium-firm organic rubber core is constructed of 3" firm rubber and 3" medium rubber. It is 2-sided. One side is made with Obasan's luxurious organic cotton velour for a softer feeling, and other side is finished with elastic cotton knit providing a firmer feel. The 2-sided mattress allows your child to start sleeping on the softer side, and when he or she becomes heavier, flip the mattress over.

The cover is quilted using 100% organic wool and is removable so it's easy to air out or spot clean. Obasan does not use harmful, fire-retardant chemicals. Instead, they use organic wool that is quilted into the cover and makes an all-natural fire barrier.

Availability: In-Store (On Display in Calgary, Edmonton & Sherwood Park)
Buy Securely Online (Free Shipping Across Canada)
Compressed & Rolled - Delivered Direct to Your Door via UPS

Stretch-knit organic cotton fabric Mattress features generous helpings of natural fibres Replaceable interior mattress components Pure non-allergenic wool to regulate temperature and humidity

Product Details

  • Cover details:
    • 100% GOTS-certified organic cotton knit top, sides & bottom
    • 100% GOTS-certified organic sheep's wool from Argentina, quilted to outer covering, on all sides
      • Wool acts as a natural fire barrier without the use of potentially risky alternatives
    • The cover is removable & reversible to allow you to flip and rotate the individual rubber layers
  • 6" total of 100% GOLS-certified organic rubber tree latex, consisting of two layers:
    • 3" medium organic rubber tree latex
    • 3" firm organic rubber tree latex
    • Layers can be arranged medium on top for older, heavier kids, or firm on top for younger, lighter kids
  • Zero styrene-butadiene (synthetic latex) content
  • Extremely durable, flexible and resilient
  • Naturally antibacterial, antimicrobial, hypoallergenic, mould and dust mite resistant
  • Designed and intended for children up to 150 lbs
  • Total mattress height of approximately 6 ½" | 17 cm
  • Made in Ottawa, Canada by Obasan

Firmness & Elasticity At a Glance

Mattress Firmness 8 out of 10 - Firm
(Medium Layer on Top)

Mattress Firmness 9 out of 10 - Very Firm
(Firm Layer on Top)

Mattress Elasticity 5 out of 10 - Moderately Elastic

We believe in the Elastic Bed Principle. The best-performing mattresses are those rated 10 out of 10, extremely elastic.

t•masc (Obasan) Certificates & Testing

Recommended Support for t•masc Mattresses

A firm, flat, level surface or electric adjustable bed. All platform beds from The Mattress & Sleep Company work well with t•masc mattresses. For a traditional boxspring/foundation, choose from the Berkeley Ergonomics standard or suspension slat foundation or the t•masc foundation.

If you are planning on placing your t•masc mattress on a foundation or platform bed purchased elswhere please check with us first to ensure that it is suitable.

Boxspring Dimensions

Dimensions for our most popular boxspring types. Visit us in-store for custom sizes and additional selection.

Simply add the mattress height to any of the heights listed below for a total bed height. If you're placing one of these foundations on an existing bed frame, be sure to include the height from the floor to the support structure of your existing bed to determine the total bed height.

Foundation Heights (Imperial) Foundation Heights (Metric) Leg Height Total Height w/ Legs
Berkeley Standard Slat Foundation 2 ½"
8 ½"
6 cm
10 cm
18 cm
21.5 cm
Not available Not available
Berkeley Suspension Slat Foundation (our best-selling boxspring) 2 ⅜"
6 ½"
6 cm
10 cm
16.5 cm
23 cm
Not available Not available
Harrison Spinks Premium Foundation 8" 20 cm 4" | 10 cm 12" | 30 cm
t•masc Foundations 4"
10 cm
18 cm
3" 7" | 18 cm
10" | 25 cm
Beaudoin Breeze Platform Bed 13"
w/ legs installed
33 cm
w/ legs installed
14 ⅝" (height to top of upholstered side rails)
Ergomotion 330 Adjustable Bed 8" 20 cm 3"
Varies from 11 to 16"
Ergomotion 390 Adjustable Bed (our best-selling electric base) 8" 20 cm 3"
Varies from 11 to 16"

Additional Reading

Platform Bed & Boxspring Guide (opens in new tab)

Estimated Delivery, Shipping Costs & Availability

Varieties Which Are Typically In-Stock

The They Grow Up Mattress is typically stocked in Twin/Single and Full/Double. Please see the lead times below for situations when the They Grow Up Mattress is sold out or for all other sizes and store locations not listed here.

Lead Times for Out-of-Stock & Special Orders

All t•masc products which are not regularly stocked are typically delivered within 3-5 weeks to most locations across Canada. Please Send Us a Message should your needs be time sensitive and we will do our best to help.

In-stock t•masc mattresses are made available to our local customers for pick up and delivery. If you're located elsewhere in Canada, we will have your new t•masc mattress produced and sent directly from the factory in Ottawa.

Delivery Costs & Available Services

In-home delivery and setup of your new t•masc mattress is included at no extra cost in the Calgary and Edmonton areas, in addition to the Ottawa area as Obasan's factory is located there. In addition, our professional delivery teams are able to travel to most locations in Alberta for a reasonable cost.

Removal of your existing mattress, bed frame and furniture is also available upon request.

Located elsewhere in Canada? t•masc mattresses qualify for free shipping to most locations across Canada.

t•masc courier-eligible bedding and pillow orders qualify for free shipping to most locations across Canada on orders of $100 or more.

Organic Bed in a Box

All t•masc mattresses are modular and delivered in multiple courier-eligible cartons, which means that even if you're not near one of our stores in Alberta or the Obasan factory in Ottawa, receiving delivery of your new t•masc mattress is simple! The modular design makes it easy to carry your new mattress into your home in several pieces. All that is required is to place the organic rubber layers inside of the organic cotton and wool cover, zip the cover closed and you're all set. Even a king t•masc mattress can easily be a one-person job if necessary!

General Availability Advice

The Mattress & Sleep Company is a family owned and operated business based in Alberta, Canada. We specialize in high-quality bedding, bath and mattresses from Canada, Europe and the USA. Our vast selection makes it impossible to stock everything. For this reason, our website does not offer real-time inventory availability as many of our products are made to order.

Please read the availability details above as we do make an effort to draw attention to products which are typically in stock in our Calgary, Edmonton and Sherwood Park stores and warehouses.

For time-sensitive needs, please give us a call Toll-Free on 1 (877) 750-1212 or Send us a Message and we will be delighted to help.

The Sleep Sound Guarantee®

We shop our competition on a regular basis to ensure The Mattress & Sleep Company offers competitive prices 365 days a year. However, it is impossible to guarantee we're always the lowest price out there. For this reason, we'll match or beat* any authorized retailer's advertised or privately quoted price.

If you've found what appears to be the same product for a lower price, Submit a Price Match Request. We would be delighted to work with you to earn your business.