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Performance 240 - medium 5ft King size Mattress by Mammoth

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Performance 240 - medium 5ft King size by Mammoth
SAVE £370
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UK King size150 x 200 cm


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Other sizes available:

UK Single size90 x 190 cm

£1,069 £799

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UK Small double size120 x 190 cm

£1,199 £899

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UK Double size135 x 190 cm

£1,199 £899

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UK Super King size180 x 200 cm

£1,739 £1299

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Not sure which size you need?
Try our size guide or contact us for some expert help

Mammoth's unique medical grade foam is a revolution in sleeping technology.

This foam promotes deep healing sleep, and has been endorsed by the Chiropractic Patients Association, the Department of Health, and the National Institue for Clinical Excellence.

Ideal for athletes and sportspeople, the Mammoth range has been specifically designed to offer the perfect conditions for muscule and joint recovery after exercise.

Medical grade foam has been used in hospitals and clinics for years to give patients the best conditions for healing during sleep - the Mammoth range brings this technology to your home, where you can benefit by getting the best sleep whether you have a chronic condition, or you simply want to get the best night's sleep possible!

Unlike memory foam, the high specification medical grade foam is not heat reactive, meaning it reacts the same whether the sleeping environment is warm or cool. It also does not trap heat in the same way that memory foam can, meaning that these mattresses allow you to sleep in a cool, comfortable position.

Featuring a 10 year Mammoth guarantee, the Performance 240 is hypoallergenic, and features a cooling cover and integrated mattress protector.

The Performance 240 is a 22cm deep mattress.

At a glance



medium feel

Free Delivery


This UK King mattress measures 150 x 200 cm.


This mattress is delivered in 2 - 3 weeks

Do you need a bed frame too...?

Buy this mattress with any same-sized bed frame and get 5% discount on each!

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Impartial help

We've been selling mattresses for decades, and can give you expert, impartial advice about what mattress will best meet your needs.

Whether you are after a quality starter mattress, or a luxurious full bedroom suite, we can help.

Free delivery

We deliver free for all orders to mainland England and Wales. See our deliveries page for details.

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