Simba Summer Hybrid® Duvet


A wonderfully light, 4.5 Tog duvet with the perfect level of down-like comfort to soothe you to sleep in warmer months (or if you get too hot at night). It features our Simba Renew Bio™ fill and Stratos® ‘cool-touch’ technology to ensure optimum breathability and heat control. Includes 100% cotton outer.

We use our engineering expertise and the latest tech to bring you your best night’s sleep ever… Here’s how it works in this 4.5 Tog duvet.

Exceptional comfort

Simba Renew Bio™ forms the lightweight, down-like centre of our luxurious Hybrid® duvets; it’s made from recycled PET bottle fibres, gently combed into soft, airy layers of comfort. Being superbly breathable, it also allows plenty of airflow through the duvet fill for perfect, non–clammy warmth.

Stratos® temperature control 

AKA your duvet thermostat

Getting too hot at night is a common and disruptive sleep problem, especially during the warmer nights of Summer. Which is where our thinner, 4.5 Tog duvet comes in.

But that’s not the only way Simba helps keep you cool. Because all our Hybrid® duvets feature our ingenious Stratos® technology on one side; this makes the fabric feel instantly cool to the touch, as well as enabling it to react to your body temperature, dissipating any excess heat to keep you cool and dry (even when it has a cover on it). For optimum temperature control, make sure this side is closest to your body as you sleep.

Sustainable comfort

Simba Renew Bio™ is key to the superb comfort and quality of our pillows and duvets. It’s made from recycled PET bottle fibres. But it also biodegrades at end of life and almost totally dissolves in about two years when deposited in a landfill environment. 

We also use natural, breathable cotton in our duvets, but we’re careful where it comes from. We’re delighted to be part of the Better Cotton Initiative (BCI), a not-for-profit organisation which makes global cotton production better for the people who produce it and the environment it grows in. Better Cotton is not physically traceable to end products, but BCI farmers benefit from the demand for Better Cotton in equivalent volumes to those we source.

User-friendly, thoughtful design

There’s no point having all this ingenious tech if you forget the practical stuff. So of course - we haven’t. Our Hybrid duvet is stitched into squares to prevent clumping, it’s machine washable (in a large enough machine) and dries quickly due to the lightness and nature of the fill fibres.

We’ve also added a QR code to a label on the duvet for easy access to recycling or care advice – and we’ve popped another label at the foot end of the duvet, so you’ll always know which way round it goes.


Simba Summer Hybrid® Duvet
About the brand


Simba Sleep's standard mattress consists of five layers of foam and 2,500 conical springs, which allow it to be folded in two and vacuum-packed into a cardboard box. In October 2019, Simba Sleep launched a premium version of its regular hybrid mattress, which contained 5,000 springs.

Simba also launched a duvet containing Outlast, a technology that was originally developed for NASA to protect astronauts from temperature changes during space exploration. The company has since developed its own version of the technology, known as Stratos, which it uses in its duvets and pillows.

More Information

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Brand Simba
Bedding / Bedroom Interiors Duvets