ComfortSleep 15cm Kids Mattress
- 5 cm reflex foam on a 10 cm foam base
- No springs to creak on a top bunk
- Removable, washable stretch-knit cover
- Shorty to European double
Good for
- Bunk beds
- High sleepers and cabin beds
- Day beds
- Children's single beds
Made in Britain by a British manufacturer
Free weekday delivery on a date you choose in your basket
Arrives rolled and boxed, easy to carry upstairs
- Depth
- 15 cm
- Guarantee
- 1 year
- Firmness
- Medium, 5/10
- Family-run UK business
- Free delivery to mainland UK
- Pay by card, PayPal, Apple Pay or Google Pay
- Secure checkout
The Millie & Jones ComfortSleep 15 is our everyday foam mattress for growing children, and a popular choice for bunk beds and high sleepers. It's built in two layers: 5cm of reflex foam on top for a cushioned surface, and a 10cm foam base beneath that keeps the child evenly supported.
There are no springs in it, so there's nothing to creak when a child turns over on a top bunk. It has a medium feel, which makes it a sensible all-rounder for children of any age.
At 15cm deep, it suits bunk beds, high sleepers, mid sleepers and cabin beds whose maximum mattress depth is at least 15cm, and it's just as right on a standard bed or day bed. That depth matters on a raised bed. The guard rail is designed around a maximum mattress depth, so on any bed rated for 15cm or more it stays at its full safety height.
The soft stretch-knit cover comes off and goes in the wash, and a non-slip base fabric helps keep the mattress in place. It's made in the UK and tested to BS 7177 (low hazard) by an independent UKAS-accredited laboratory. It arrives rolled and boxed, so it fits through a doorway and up a staircase; unroll it and give it time to expand before it's slept on. It comes in eight sizes, from shorty to European double, and carries a 1-year manufacturer's guarantee.
Key facts
- Depth: 15cm
- Sizes: Shorty 75 x 175cm, Small Single 75 x 190cm, Single 90 x 190cm, European Single 90 x 200cm, Small Double 120 x 190cm, European Small Double 120 x 200cm, Double 135 x 190cm, European Double 140 x 200cm
- Weight: About 8kg for a single, about 12kg for a double
- Layers: 5cm reflex foam comfort layer, 10cm foam support base
- Springs: None, it's all foam
- Firmness: Medium
- Cover: Soft stretch-knit, removable and washable, with a non-slip base fabric
- Suits: Bunk beds, high sleepers, mid sleepers and cabin beds with a maximum mattress depth of at least 15cm, plus standard beds and day beds
- Fire safety: Meets BS 7177 (low hazard), tested by a UKAS-accredited laboratory
- Made in: The UK
- Arrives: Rolled and boxed
- Delivery: Free to mainland UK, on the date you choose in your basket
- Guarantee: 1-year manufacturer's guarantee
Will it fit your bed?
Choose the size your bed's page asks for, not the size you'd guess from the frame: a European single (90 x 200cm) is 10cm longer than a UK single (90 x 190cm), and a European double is 140cm wide rather than 135cm. On a bunk bed, high sleeper, mid sleeper or cabin bed, the bed's page gives its maximum mattress depth; at 15cm, the Millie & Jones ComfortSleep 15 suits any bed whose limit is 15cm or more. A trundle slides under the bed above it, so its page gives its own maximum depth; our Millie & Jones TrundleEase 10 is made for trundles. Our shorty is 75 x 175cm; if your shorty bed takes a different size, just ask and we'll help you find the right one.
Questions parents ask
Can I use it on a top bunk or high sleeper?
Yes, if the bed's maximum mattress depth is at least 15cm. The bed's page gives its maximum, and if it isn't listed, just ask and we'll confirm it.
Can I use it on a trundle?
Only if the trundle's maximum mattress depth is at least 15cm, because a trundle has to slide under the bed above it. Our Millie & Jones TrundleEase 10 is made for trundles.
Does the cover come off for washing?
Yes. The stretch-knit cover is removable and washable, so accidents don't mean a new mattress.
What's Included
- Millie & Jones ComfortSleep 15 mattress in your chosen size, with its removable cover
- Depth
- 15 cm
- Firmness
- 5 out of 10, Medium
- Construction
- 5 cm reflex foam over a 10 cm foam base, no springs
- Cover
- Soft stretch-knit, removable and washable, with a non-slip base
- Good for
- Bunk beds, High sleepers and cabin beds, Day beds, Children's single beds
- Arrives
- Rolled and boxed
- Guarantee
- 1 year
- Fire safety
- Meets BS 7177 (low hazard)
- Made in
- Britain
Free weekday delivery on a date you choose in your basket
At Millie & Jones, we make delivery simple and flexible. Once you add your items to your basket, you can choose your preferred delivery date for free, whether that’s tomorrow or up to 4 months in advance. Need extra time? We’ll reserve your items safely in our warehouse until you’re ready, ensuring a smooth, stress-free delivery exactly when it suits you. You’ll also receive a 3-hour delivery window and a courtesy call 60 minutes before arrival, so you’ll know exactly when to expect us.
Read more about how delivery works on our delivery information page.
Tell us within 14 days of delivery if you change your mind, then return it within a further 14 days. Return costs are yours.
For hygiene reasons we can't take back a mattress that has been removed from its sealed protective packaging, unless it's faulty. If it arrives faulty or damaged, you can reject it for a refund within 30 days of delivery.
To start a return, email support@millieandjones.co.uk with your order number. Full details are in our returns and refunds policy.
It arrives rolled. Unbox it soon after delivery, in the room it's going in. Lay it on the bed, cut away the wrapping carefully and let it unroll. Give it time to recover its full shape before you sleep on it.
Rotate it head to toe regularly so it wears evenly, and turn it over only if it's double-sided. A waterproof protector keeps it clean and fresh for longer.
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Real People to Talk To
Not sure which mattress or depth suits the bed? Message our family team on WhatsApp before you order.
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Buy With Confidence
Every product includes a manufacturer guarantee. If something's not right, we'll make it right.
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Delivered Free, On Your Schedule
Free delivery to mainland UK. Choose a date that works for your schedule.
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Set Up & Ready to Sleep
On selected beds, add assembly on the bed's page and a two-person team will build it in the room of your choice and take the packaging away. For any other bed, you can book a local assembler through Taskrabbit.
