The Ortho Sleep 1500 mattress is perfect for providing back and joint support, thanks to the innovative design that’s rich in high density recon foam. The Ortho Sleep 1500 offers great support and ultimate comfort, ensuring an excellent night’s sleep.. . The Ortho Sleep 1500 is crafted with sanitised materials which make it hypoallergenic and the high quality materials ensure durability and a long life for the mattress. This makes it a great option for allergy or asthma suffers and will help them get a peaceful night's sleep.. . The Ortho Sleep 1500 mattress is available in medium and firm tension and conforms to all British fire regulations for that extra peace of mind.