TOG stands for Thermal Overall Grade and is an industry-recognised measurement for the warmth of garments and bedding. Put simply: The lower the TOG rating, the lighter the fabric. The higher the TOG rating, the warmer the fabric. Below are guidelines around how to dress your baby/toddler based on the room temperature. This is only a guide. The number of clothing layers may vary according to a baby's health, their physiology & the temperature in the room.