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A 0.5 TOG sleep sack is the lightest wearable blanket made, built for rooms between 75°F and 80°F (24°C to 27°C). TOG measures insulation on a scale running from 0.2 to 3.5.
It holds one thin, even layer over the chest and legs so body heat leaves at a steady rate instead of building up, with nothing loose to kick off or pull over the face. Kaiya Baby's is a single layer of GOTS-certified organic cotton with no filling.
One layer of cotton, woven or knit, with no fill. At this weight, the fabric works alone, so it has to move air and carry moisture off the skin. GOTS certification tells you the fibre is traceable.
Avoid a padded lining on anything sold for summer. The loft is carrying the rating, and it traps warmth in patches. Kaiya Baby's 0.5 TOG sacks are 100% GOTS-certified organic cotton, with newborn sizing from 0 to 6 months.
75°F to 80°F (24°C to 27°C). Below 75°F, move up to 1.0 TOG.
Measure at the crib, not the hallway. A closed door or a west-facing window can shift the sleep space three to five degrees. Check the baby too: warm and dry at the back of the neck is right, while sweating or a hot chest means one layer too many. Hands and feet run cool and tell you nothing.
At 80°F (27°C) and above, a diaper or a short-sleeve onesie. From 77°F to 80°F, a short-sleeve onesie. From 75°F to 77°F, the same, with long sleeves if the night cools. Below 75°F, switch to 1.0 TOG rather than adding a layer underneath.
The AAP rule of thumb is one layer more than you are wearing, and the sack is that layer. No hat indoors.
Yes, and overnight is what they are built for. The AAP tells parents to keep loose blankets out of the sleep space and use clothing layers or a wearable blanket instead.
Check three things on any sack: the neck opening cannot slide up past the shoulders, the armholes are fitted with no hood, and the size matches your baby's height and weight now. Then match the TOG to the room, since overheating is a recognized SIDS risk factor.
One layer with no fill, a two-way zipper that opens from the bottom for 2 am diaper changes, a fitted neck and armholes, and the right sleeve for your room.
Fit matters more in summer than in winter. A sack a size too big lets air circulate inside it and undoes the even layer. Kaiya Baby's 0.5 TOG comes sleeveless, long sleeve, and in a walker cut, in three sizes from 0 to 36 months.
From this collection. Kaiya Baby makes these sacks in its own factory and sells them directly, so the fibre content, the size chart, and the care instructions come from whoever made the garment.
If you are comparing elsewhere, check that the listing states the TOG rating, the full fibre content, and a size range in both height and weight. A sack with no stated fibre content is usually a polyester blend.
About five degrees of room temperature and one layer of construction. A 0.5 TOG sack is a single layer of fabric for rooms from 75°F to 80°F (24°C to 27°C). A 1.0 TOG carries filling between the shell and the lining, which puts it at 68°F to 75°F (20°C to 24°C).
The difference shows up in what goes underneath. A short-sleeve onesie is usually the whole outfit under 0.5 TOG, while 1.0 TOG takes long sleeves at its cooler end. The Kaiya Baby 1.0 TOG is filled with camel wool and SORONA; the 0.5 TOG has no filling at all.
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