Our A-Z guide continues with information from N-Z. New - mattresses are far preferable to second-hand ones. If your mattress is over 10 years old, you need to start thinking about buying a new one. Open coil - one of the most common methods of mattress construction, open coil mattresses are made up of a number of coils that are linked together by wire, forming the sprung interior of the mattress. Pocket sprung - these mattresses take the open coil process to a new level - hundreds of individual springs are manufactured. Each spring is then sewn into its own individual pocket and the pockets are joined together to make the basis of the mattress. Queen size beds - this size of bed is available in the USA, but not in the UK. British customers can choose from standard double, king or superking sized beds. Rating - every mattress is given a rating to show how firm it is. There is no single standard for mattress rating - the ranges are normally determined by each manufacturer. Look for the rating of the mattress you're trying so that you can compare it to others. Support - this is the most important thing to consider about your mattress. The better support it provides, the better you will sleep. You need to try out a number of mattresses in order to discover which ones support you best. Ticking - this is the name for the outer covering of the mattress. Whilst manufacturers make the ticking colourful or patterned, its function is to hold the mattress together. It needs to be robust and well fitted so that it extends the life of the mattress. Upholstery - all mattresses are upholstered in some form or other. The types of upholstery material chosen and the ways they are used help to determine the comfort and support that the mattress offers. Value for money - is easy to get if you buy your mattress online. Retailers can pass their savings onto customers and, with a bit of research, you can find a great mattress for your money. www.mattressnextday.co.uk - is the perfect place to find your new mattress. With a wide range of mattresses in stock and free next day delivery on most items, we should be your first stop. Xtra large - the bigger bed and mattress you can get, the more likely you are to sleep well. If you share your bed, get the biggest one you can fit into your room so that you and your partner have the width and length you need to get a comfortable night's sleep. Yes - we can deliver your mattress to you the day after you buy it, and we can give you the help and advice you need to make the right choice. Zzzzzzzzz - that's how we want you to feel when you've had your new mattress delivered! Mattress Next Day is probably the largest mattress superstore on the internet. Selling a wide range of mattresses from leading manufacturers, we can offer quality mattresses at fantastic prices. Our next day delivery service is free or, if you prefer, you can select your own delivery date. We can even guarantee delivery before 9.30am on request. Take a look at our range of mattresses now at www.mattressnextday.co.uk, or call us on 0844 3911 222 for more information.