A Hollow fiber Duvet Tog of 15 indicates a high level of insulation, making the duvet ideal for colder Superior Warmth. Remember, the choice of duvet tog rating depends on individual preferences, the temperature of your bedroom, and your local climate. While tog 15 offers significant warmth, some individuals may find it too hot for their needs, particularly in milder seasons or if they tend to overheat while sleeping. It’s easy to care Machine Washable and Tumble dry. level of insulation