TOG is a measure of thermal resistance used in the textile industry. A high tog value has a higher thermal resistance than a lower tog value, so a high tog value will keep you warmer. Lower tog value blankets are sometimes referred to as summer togs while higher tog value blankets are referred to as winter togs.
The thickness and weight of a blanket is not universally related to the tog value because different materials have different thermal properties. For example, silk duvets are thinner than other blankets of the same tog value, but will keep you just as warm because silk is a great insulator.
The tog you require will depend on your general climate. If you often find yourself overheating under conventional high tog duvets, but find that summer duvets do not keep you warm, then silk duvets may be your perfect solution as silk insulates but the lattice structure of the silk filling is also breathable.
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There are many legends on how silk was first discovered some more believable than others, such as the one we have read online about the flying, talking horse and the girl (not so believable).
According to Chinese legend, silk was first discovered in 2640 BC by XiLingJi, the fourteen year old wife of China’s third Emperor – called “Yellow Emperor”- HuangDi.
It is said that XiLingJi was having tea beneath a mulberry tree in the palace gardens, when a cocoon fell from the tree into her cup of hot tea. She and her handmaidens were astonished to see the cocoon start to unravel, revealing a long delicate thread. XiLingJi was so delighted by its beauty and strength that she had thousands of cocoons collected and then wove them into a robe for the Emperor.