Simba Hybrid Cot Bed Mattress Review

Simba Cot Mattress Review UK (2024)

Last updated: 28.04.2024 Reading time: 5 Min.

One thing new parents should never skimp on is a high-quality cot bed mattress.

The mattress you choose for your child needs to be firm enough to guarantee safe sleeping and have all the necessary health and safety features.

Luckily, the Simba Hybrid cot bed mattress fulfils all of these requirements. 🥳

Find out more in our Simba cot mattress review.

Top features of the Simba cot bed mattress

Highly Recommended
Dual-Sided For Babies & Toddlers
Water-Resistant Inner Cover
Machine-Washable Outer Cover


  • Dual-sided mattress with a firmer baby side and a softer toddler side
  • Waterproof inner lining
  • Removable and machine-washable top cover
  • Conforms to BS EN16890 and BS7177 safety standards
  • Free next-day delivery if ordered before 2 pm
  • 30-day trial period
  • 2-year guarantee


  • Only available in the 70 x 140 cm size
  • Quite pricey

Simba cot mattress composition

The eight-layered Simba cot mattress features a sophisticated hybrid construction and has been designed with a baby’s comfort and support in mind.

Conveniently, this is also a dual-sided mattress:

  • Baby side: This firmer side of the mattress is designed for babies aged 0 - 12 months. Newborns and babies need to lie flat and straight on firmer support to decrease the risk of suffocation.
  • Toddler side: This softer side is designed for toddlers aged 1 - 3 years. As little ones grow, a mattress with more responsive, cushiony comfort is better suited.

Below, we’ll examine the exact layers of each side of the mattress in more detail, but it is worth remembering that the mattress is a complete product, and you’ll always have all the layers.

eight layers of the simba cot mattress
The Simba cot is a dual-sided mattress with eight layers.

The only difference is which side you’ll choose to have on top.

Composition of the firmer baby side

The firmer baby side will have these three layers on top:

  • 315g washable knitted top cover
  • Water-resistant inner lining made from polypropylene
  • Thick 50 mmD layer of firm Simba Renew fibres, made from recycled materials and heat-treated for correct firmness and density

By keeping this side of the mattress towards the top, your baby is guaranteed to sleep on a flat, firm surface.

Composition of the softer toddler side

The softer toddler side will have these five layers on top:

  • Soft, breathable knitted cover, which is removable and machine-washable
  • Water-resistant inner lining
  • Cushioning layer of Simba Renew fibres, which is a slightly softer comfort layer to provide cloud-like support (15mmD of soft, fleecy fibre)
  • Medium-firm layer of Simba Renew fibres, which helps provide optimum core support (15 mmD of medium fibre)
  • Responsive Aerocoil spring layer, which provides responsive support and edge-to-edge stability. This layer consists of 648 x 20 mm conical pocketed springs made of high carbon steel and manufactured in Leeds, enclosed in a 100% polypropylene pocket

By keeping this side of the mattress towards the top, your baby is guaranteed to sleep on a supportive surface that offers a tad more cushioning and comfort.

How firm is the Simba cot mattress?

As we’ve seen, the Simba cot mattress offers two firmness levels: one firm side for babies and one softer side for toddlers.

This is necessary not only for health and safety but also to assist your little one more adequately during this important growth period.

The Lullaby Trust product guidelines [1] state that baby mattresses must be firm, entirely flat, and waterproof, with no cushioned areas, particularly around the baby’s head, as soft mattresses are known to increase the risk of suffocation and SIDS.

The Simba cot mattress meets health, safety, and comfort requirements with its uniquely engineered design.


Our mum tester loved the look and feel of the mattress, and our baby tester has slept comfortably on the baby side from birth.

simba cot mattress firmer side label

Conveniently, each side of the mattress cover is also labelled, so you’ll know exactly which side is on top.

Health and safety: Simba Hybrid cot bed mattress certifications

Safety is paramount when it comes to products designed for children, and the Simba cot mattress adheres to strict British safety standards:

  • BS EN16890 [2] (Children’s Furniture - mattresses for cots and cribs)
  • BS7177 [3] (Resistance to ignition - mattresses, mattress pads, divan and bed bases)

Simba Sleep is also a proudly B-Corp-certified [4] company with carbon-neutral delivery, making its products not only safe for your baby but also for the world your little one will grow up in.

Can you wash the Simba cot mattress cover?

The cover of the Simba Hybrid cot bed mattress is designed for easy care and maintenance, which is a relief for any parent dealing with the messes that come with a young child.

Not only is the core of the mattress protected by a waterproof cover, but the outer top cover is also easily removable and machine-washable at 40℃.

You cannot tumble dry or iron the cover.

simba cot mattress removable cover
The top knitted cover is removable and machine-washable.

Simba cot mattress sizes

The Simba cot mattress is available in one standard size: 70 x 140 cm (27.5 x 55 inches).

This is slightly larger than the 60 x 120 cm (23.6 x 47 inches) cot bed size but accommodates the flippable nature of the mattress and allows you to use it for a longer period of time.

The mattress has a height of 10 cm (3.9 inches).

Safety recommendation: the maximum gap between the mattress and the sides of the cot should be no more than 30 mm.

What does the Simba cot bed mattress cost?

The Simba cot mattress is not a cheap product, but it’s an excellent purchase.

It’s also designed for long-term use and is well-suited to babies and children up to the age of 3.

Simba Sleep also offers flexible finance options, which is particularly helpful for new parents who are often strapped for cash.

You can spread the cost of your order over 12 months with 0% interest, but flexible options to spread payments over a longer period at set interest rates are also available.

Simba cot bed mattress delivery conditions

The Simba baby mattress comes with free, carbon-neutral delivery.

  • If you order before 2 pm, you’ll get free next-working-day delivery to most mainland UK postcodes
  • If you order after 2 pm, you’ll get free standard delivery within two working days

The cot mattress is delivered flat and should be stored flat until you can place it in your cot bed.

simba cot mattress box
The Simba cot mattress is delivered flat in a cardboard box.

Should you buy the Simba cot mattress?

The Simba Hybrid cot bed mattress is an excellent product, and our baby tester is getting the best sleep on it.

If you’re looking for a fabulous product that’s conveniently designed for longer-term use, the Simba cot mattress is an excellent choice.

Contact Simba Sleep UK

Customer service: To contact Simba Sleep directly for complaints, support, or queries, please e-mail them at or visit their live online chat. The customer service team is available Monday to Friday, from 9 am - 5 pm, and Saturdays from 9 am to 1 pm.

Registered office: Simba Sleep, The Stable Yard, 60 Petty France, Westminster, London SW1H 9EU

Frequently asked questions



Editor & Certified Sleep Therapist

Nicky is an experienced writer and editor with numerous qualifications. As a certified sleep coach, her interests lie in understanding how sleep problems arise from hormonal and environmental issues, particularly as part of stress and anxiety management.

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