Tog ratings are very important when you are going to purchase a duvet cover especially super king size duvet cover due to its large size and price. The Manufacturers use tag rating to check products performance. Tog is a standard name adopted by the industry to use for measuring the warmth of a cover. Tog rating helps purchaser to select a cover according to the season. Duvet will be warmer if the tog rating is high and the one having low tog rating will be suitable for summer season. Many companies sell joint covers sets consisting of two duvets, one of 4.5 tog and other of 9.5 tog. One thing should be cleared in mind that the tog rating never represent how heavy, light or thick the cover may be. For the awareness of purchaser, tog guidelines for duvets are as follows:

• Light weight summer duvet: 4.5 tog
• Spring and autumn weight duvet: 9.0 - 10.5 tog
• Winter weight duvet: 12.0 - 13.5 tog

The warmness, heaviness and smoothness of a cover depend on filling material and tog rating. Tog ratings indicate a duvet's capability to entrap warm air. Duvets filled with natural material have better thermal properties than synthetic. This kind requires a smaller amount of filling to get the equal level of warmness. Duvets with natural fillings are soft, light and comfortable. Natural fibers help the skin to breathe more efficiently. They are also highly flexible and have a propensity to last longer than duvets with synthetic fillings. On the other hand, synthetic duvets are also being produced in lighter weight giving the same warmness. Thus a purchase has variety of choice to decide about a cover. Those who are allergic to feathers and down can use synthetic duvet cover. Natural filled duvet lasts longer than synthetic filled one. Frequent washing of it will leave an impact on its life span. Duvets with Synthetic filling are very light and comfortable. It hugs the shape of your body while you sleep. Such duvets are made with a highly squashed unique synthetic innovative material.

As far as the cover for children is concerned it should be the one having lover tog rating and easy to be washed. It can be washed in the home washing machine at approximately 60 degree centigrade and dries rapidly by hanging on the line. In case of warm home tog ratio around 4.5 to 6.0 is ideal. Babies less than twelve months of age must not use duvet since children of this age group get too warm.