Tog value is a term used in the industry to measure a duvet's warmth. A higher tog value indicates greater warmth, independent of the duvet's weight. Tog value is measured in units of thermal resistance. 

For example, a duvet with a tog value of 4.5 is ideal for summer, while those with 13.5 and above are excellent for colder seasons. 

Use the tog table provided to assist in selecting the right duvet.