The industry standard term for describing the degree of warmth provided by a duvet is "tog." Although the tog does not necessarily indicate how heavy, light or thick a duvet or quilt may be, the greater the tog rating or tog value, the warmer the duvet or quilt. Your body can be protected from the cold just as well by lightweight comforters and duvets as by heavy ones. This is so that different duvet and quilt fillings can provide different insulation levels.
Thermal resistance is expressed in togs. For instance, a duvet or quilt with a tog value of 4.5 would be better suited for use during the heat. In contrast, during the year's colder months, duvets or quilts with a tog rating of 13.5 or greater would be utilised.
Winter >>>>>>>>>>>>>>>>>>>>>>>>>>>> summer
The most typical tog ratings for quilts or duvets range from 15 togs, which is thought to be the greatest tog rating possible, to four point five (4.5) tog, which is the bedding industry minimum.
Consumers frequently believe that a synthetic duvet or quilt, such as one filled with Hollowfibre or cluster fill fibre, will be colder and less effective than one filled with natural materials, such as goose or duck down. Simply said, this is false. Compared to synthetic-filled duvets, goose or duck down is lighter and has a higher fill power. The equivalent tog value of a synthetic duvet can be achieved with less natural filling.