The Sareer Memory Foam Gel Foam Matrah Mattress made by the NBF-approved Sareer team features a 12.5cm layer of memory foam & a 2.5cm layer of gel foam. The foam layers, combined with a luxurious quilted cover, mould to your body's natural sleeping position & also regulates temperature & humidity, maintaining a pleasant sleeping environment throughout the night. * For health & hygiene reasons, we are unable to offer refunds or exchanges on mattresses unless they are returned unused & in their original packaging. For more information please see our Easy Returns section. For more information on different mattress types, please visit our Mattress buying guide. Click here for more information.