What is a tog rating?
The TOG rating describes the warmth or 'Thermal Resistance' of a fabric, and is widely used in the UK to describe warmth levels of duvets and sleeping bags. For example, an adult winter duvet is usually between 10 and 15 TOGs and a summer duvet around 4.5 TOGs. It is recommended that quilts for babies and young children above 1 year should be no more than 4 TOGs, and the health professionals recommend that baby sleeping bags should be of a low TOG rating. TOG values need to conform to British Standard BS4745:1990 which is the method for determination of thermal resistance of textiles.
Our merino has a tog rating of 2.5