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The tog is a measure of thermal resistance, The Shirley Institute in Britain developed the tog as an easy-to-follow alternative to the SI unit of m2K/W.
The tog is a measure of thermal resistance, The Shirley Institute in Britain developed the tog as an easy-to-follow alternative to the SI unit of m2K/W.
Launched in the 1960s, the Shirley Togmeter is the standard apparatus for rating thermal resistance of textiles, commonly known as the Tog Test.
A tog is 0.1 m2K/W. In other words, the thermal resistance in togs is equal to ten times the temperature difference (in °C) between the two surfaces of a material, when the flow of heat is equal to one watt per square metre.
Ttog guidelines for duvets are as follows:
| Lightweight summer duvet:
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4.5 tog
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| Spring/Autumn weight duvet:
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9.0 - 10.5 tog
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| Winter weight duvet:
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12.0 - 13.5 tog
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