"This is a standard UK double bed mattress, 4ft6 by 6ft3 and approx 9"" deep including loft (135cm by 190cm x 22cm) approx. Please ensure this is the correct size for your base prior to ordering to avoid disappointment. A deep filled quality mattress. Built around the 13.5g open coil Bonnell spring unit with insulator pads and deep layers of comfort fillings on both sides, topped with a layer of the revolutionary Airstream Memory Fibre. It has a medium soft feel comfort level. A single sided mattress, covered in a soft feel ""Wave"" design micro-quilted Cooltouch fabric and an Anti-Slip fabric base. It has a 3d ""AirFlow"" border to help keep your mattress fresh. Made in the UK, the G3D Wave by eXtreme comfort ltd is fully compliant with all relevant UK fire safety regulations for domestic use. (BS 7177 : 2008 (Low Hazard)) These mattresses are compressed, vacuum packed, rolled and boxed for ease of handling and will need several hours to air to size prior to use. Packaging is for transportation only. Please do not leave mattresses rolled for more than 7 days from receipt."