What is a TOG?

What is a TOG?

The simplest way to explain it is this - a TOG rating is used for measuring the warmth levels of duvets (doonas) and baby sleeping bags. The higher the number, the warmer it will be and the lower the number, the cooler or lighter it will be.

TOG stands for Thermal Overall Grade, and in more technical terms is used to measure the thermal resistance of a unit area (also known as thermal insulance). It is commonly used in the textile industry and was developed in the UK to explain warmth levels of duvets (doonas).

It is interesting to note, that in the UK, a Summer doona is rated as between 3.0 - 4.5 TOG, while a doona used for Spring/Autumn is rated between 7.5 - 10.5 TOG, and a Winter doona is rated between 12.0 - 13.5 TOG (wow, that's pretty high right).  

So think about these numbers in the context of doonas used by adults or older children.  Granted it is assumed that there are no other factors being considered, like room temperature or clothing used in bed.

For Babies however, please note: There are a number of other factors that should be considered when determining what TOG rating sleeping bag you should use for your baby.   These include the clothing your baby is wearing, the room temperature of your baby's room, your baby’s health and other bedding/blankets you will be using.

Check our guide for what baby should wear under a sleeping bag.

And always check your baby regularly to ensure they do not overheat.

 

TOG Testing

All our sleep sacks and sleep suits are TOG tested by  by Bureau Veritas UK and have passed British Standard 8510: 2009 Clause 7 (Thermal Resistance) and we choose to use only natural fibres like cotton as this helps with thermal regulation by offering breathability and prevents sweating, which can cause fluctuations in temperature in the night.

Our sleep sacks are tested by Bureau Veritas UK and have passed British Standard 8510: 2009 Clause 7 (Thermal Resistance) and are TOG rated a follows:

  • .1 TOG - suitable for the warmer (summer) season
  • .7 TOG - suitable for all seasons (with appropriate clothing and bedding)
  • 2 TOG - suitable for the colder (winter) season 

 

Ideal Room Temperature

The recommended room temp to ensure your baby sleeps well is between 18 Cº - 22 Cº.  

 

To read more about dressing your baby appropriately,  check our guide for what baby should wear under a sleeping bag.

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