Discover 13 layers of innovative natural luxury and signature tech.
Sleep surface: Thick, anti-allergenic knitted cover zips off for washing, 100% breathable, with mesh border for extra airflow. With cooling Stratos® technology to support temperature regulation. Replacement covers available. Inner cover: Internal casing protects core layers.
The Simba Hybrid® Ultra Mattress is 34cm deep and includes 8 carry handles (Single size has 4).
Top cover: 525g anti-allergenic knitted top cover (washable) with cooling Stratos® technology to support temperature regulation. Replacement covers available to purchase. 100%
polyester fibres. 60% recycled
Inner cover: 100% polyester 100% recycled
(250gms) Wool (80%), charcoal-infused bamboo (10%), & kapok fibres (10%). 100% renewable and biodegradable.
CertiPUR® ® foam (graphite infused) 100% recyclable.
Latex and coconut fibre blend. 100% renewable and biodegradable.
CertiPUR® foam border, conical Aerocoil™ pocket springs, manufactured in Leeds from titanium alloy and high-carbon steel, enclosed in a 100% polypropylene pocket. 100% recyclable.
CertiPUR® foam. 100% recyclable.
CertiPUR® foam border; up to 3,500 Aerocoil springs manufactured in Leeds from high-carbon steel, enclosed in a 100% polypropylene pocket. (high carbon steel) 100% recyclable.
Barrel spring casing made from 100% polyester spun fibres. 100% recycled.
Barrel springs made from high carbon steel. 100% recyclable.
CertiPUR® foam, 100% recycled.
Rotate your mattress once a month for the first three months, then every three months or seasonally thereafter.
Top cover: the top section of the outer cover can be zipped off and washed at 40°C on a reduced spin cycle, then line dried (If it can’t be washed/dried/replaced in the same day, the inner fabric cover is suitable to sleep on.)
Base cover: the grey base fabric can be cleaned with a soft, damp, clean cloth using small circular motions.
Our tech team left no stone unturned. Until they found what they needed to create their perfect mattress.
Our technologists insisted on a whopping 8,500 in the Ultra, more than any other Simba mattress. It’s the only way to get perfection they said, and we could hardly argue with that.
So there are 7,500 titanium Aerocoil® micro springs in the main part of the mattress: 4,000 of them nestle centrally in 13 support zones to cradle your unique body contours, and another 3,500 of their high carbon steel cousins sit further down the mattress for maximum support and airflow.
And standing sturdily at the base is our SupportCore™ spring unit, with yet another 1,000 pocketed, tempered steel barrel springs, providing edge-to-edge support with absolutely no dipping at the sides.
We know being too hot stops us sleeping well. That’s why our perfection-seeking tech team created the cooling, cushioning Simbatex® foam in the first place.
So what is Simbatex®? It’s a less dense, open-structure foam, offering much better cushioning and 30x the airflow of standard memory foam; it’s also infused with graphite, to help heat and humidity flow away from the body.
No surprise then, that the marvellous Ultra is the ONLY Simba mattress to have a revolutionary, double layer of this miracle stuff. Because obviously the more there is, the cooler and more comfortable the mattress will be.
Our chief technologist and his team were laser-focussed on creating the coolest but comfiest top layer for the Ultra.
A combination of breathable wool and airy bamboo was the best performer in lab tests, even more so after the team added a boost of cooling charcoal. But there was something missing, something that would turn excellent into exceptional.
And then the team discovered Kapok.
Kapok has been overlooked and overshadowed for decades, until now. Found in the fruit of the kapok tree in the rainforests of Southeast Asia, it’s naturally silky soft; with an air content of 80% it’s one of the lightest plant fibres on earth, and has a fine wax coating that makes it moisture resistant. This high air content makes it breathable, thermo- regulating and naturally anti-allergenic. Magic ingredient located.
And so after all that, no chemicals, no treatments, no technology. Just a fusion of natural materials at their wondrous best.
When they couldn’t source the perfect, pressure-relieving support layer they wanted, our heroic tech team realised they’d have to invent it themselves. But being innovative isn’t always about creating new materials; sometimes it’s about finding fresh ways to use traditional ones. Which is exactly what our tech team did with latex and, believe or not, coconut.
Yes, coconut. PureLift™ is the very successful fusion of latex, well known for its amazing natural elasticity, and coconut fibres, which as we now know, are famous for their properties of resistance, bounce and durability.
In product testing, this unique blend created an incredible spring-like layer with superb pressure distribution, adapting beautifully to your body shape for exceptional and complete support.
And by the way, it also scored top marks for breathability and airflow… So it’ll keep you as cool as a coconut.
We're experts in the science of sleep, and over a million customers have already trusted us to give them the best night's sleep they've ever had.
We have 250,000 five-star reviews, which is more than any other mattress brand in the world; we’ve also won over 60 sleep industry awards including 8 Hybrid® Luxe awards.
We design and make all our mattresses in the UK, creating local jobs and reducing our environmental impact.
Using body profile data from ten million sleepers, our sleep scientists have created a mattress designed and crafted for every sleeping style and body type.
We offer free delivery and returns, with a 200-night free trial and a 10-year guarantee. You can also shop with 0% finance over 12 months, pay nothing for a year and take monthly payments up to 4 years.
3 LAYERS | 19CM DEPTHShop Simbatex® Essential
4 LAYERS | 25CM DEPTHShop Simbatex®
4 LAYERS | 20CM DEPTHShop Hybrid® Essential
6 LAYERS | 25CM DEPTHShop Hybrid®
8 LAYERS | 28CM DEPTHShop Pro
11 LAYERS | 31CM DEPTHShop Luxe
6 LAYERS | 30CM DEPTHShop GO