Select options The SnuggleSnow® Duvet £80 – £180 Experience the deluxe silky soft feel of an expensive down duvet – without the feathers. SnuggleSnow® is extremely soft yet exceptionally open and breathable with the benefits of being an environmentally sustainable duvet choice. Available in three TOG ratings: 4.5, 10.5 and 13.5. Which TOG rating is best for me? TOG stands for ‘Thermal Overall Grade’, a unit of measurement that calculates the thermal insulation of covers and clothes. It refers to the amount of air that the textile is capable of trapping as heat, and is not related to the weight. The grades run from a cool 1.0 which is the lowest level of insulation, through to very warm 15 – perfect for a freezing cold room! All duvets are measured with a TOG number. Before you decide the best TOG for your circumstances be aware that in order to sleep soundly, people need to lose at least 1% of their body temperature, mainly from their head, during the night. Sleep experts are agreed that to achieve this the optimal room temperature should be between 16-18°C or 61-64°F. Too hot a room – particularly in the summer can make it difficult to fall asleep. For summer use in the temperate area of the UK and Northern Europe, a TOG of between 2.5 and 7 will be perfect and ensure you sleep optimally. Or if your room ambience tends to warmness, something around 4.5 will be perfect for you. In the spring and autumn months, especially if you share your bed with another, and are an average build and height, 10.5 is an excellent choice that could also work well for you in the winter and summer. A 10.5 TOG is a popular all-rounder. If you live in more northern areas where the temperature regularly drops below freezing, or you are elderly and have trouble maintaining heat, or your house and bedroom are poorly insulated then consider a duvet with a TOG value of between 12.0 and 15.0. Because of their smaller frame size, children under 10 years old should not sleep under TOG ratings higher than 10.5. A single duvet will trap more air around a child than a larger adult, meaning they will be kept warmer at a lower rating.