What does the TOG rating mean?

The Tog rating describes the warmth or “Thermal Resistance” of a product and is widely used in the UK to explain warmth levels of duvets. Grobag Baby Sleep Bags are tog tested to conform to BS4745:1990 and to the new British Standard BS 8510:2009. Latest advice from Health professionals is that Baby Sleep Bags should be ‘lightweight’ and to meet the new British Standard, Baby Sleep Bags must be between 2.0 and 3.5 togs for temperatures between 10°C and 20°C. This is why our main range of Grobags are 2.5 togs for the recommended ideal nursery temperature range of 16°C and 20°C.