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A 2.5 TOG sleep sack is a wearable blanket rated for cool rooms. TOG measures thermal resistance, so the number tells you how much insulation the sack provides rather than how thick it looks. Two sacks of the same thickness can carry different ratings depending on what is inside them. Kaiya's 2.5 TOG has a GOTS-certified organic cotton shell and lining with a fill of 30% camel wool and 70% SORONA® polyester. It is worn instead of loose bedding, so there is nothing for your baby to kick off during the night.
Kaiya rates its 2.5 TOG sleep sacks for rooms between 61 and 68°F (16 to 20°C). For colder rooms, look at 3.5 TOG. For rooms between 68 and 75°F (20 to 24°C), 1.0 TOG is the closer match.
Room temperature is the starting point rather than the whole answer. What your baby wears underneath moves it, and the way to check is their chest, back, or the back of their neck. Hands and feet run cooler in infants because circulation is still developing, so they are not a reliable guide.
A sleep sack is worn instead of loose blankets, which is what safe sleep guidance from the American Academy of Pediatrics recommends: a firm flat mattress, your baby on their back, and nothing loose in the crib.
For a 2.5 TOG specifically, safety comes down to two things. Match the rating to the room, which for 2.5 TOG means 61 to 68°F. And check the fit at the neck and armholes, which should be snug enough that your baby cannot slide down inside the sack. Safe sleep guidance also advises against hats indoors.
Size by height and weight rather than by age, and check the size guide on the product page for the ranges. The fit that matters most is at the neck and armholes: snug enough that your baby cannot slide down inside the sack, loose enough that their arms move freely.
Sizing up for longer wear is reasonable within one size. Going further than that is the one fit risk worth avoiding.
For a newborn, a 2.5 TOG only makes sense if the room actually sits at 61 to 68°F. In a warmer nursery, a lighter rating fits better.
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