TOG guide: what TOG means and which rating your baby needs
A clear, practical guide to TOG ratings for baby and toddler sleeping bags: what TOG measures, a room temperature chart in °C and °F, what to put on underneath, and how to tell if your child is too warm or too cool.
Which TOG does my child need?
Pick the room temperature and your child's age. You'll see every TOG that fits, what to dress them in, and matching products in the right sizes.
What is TOG?
TOG is a unit that measures a textile's thermal resistance: how well it slows heat passing through it. One TOG equals 0.1 m²·K/W. The higher the number, the more warmth a sleeping bag holds in, so a 2.7 TOG sleeping bag is far warmer than a 0.2 TOG summer suit.
For baby sleepwear, TOG helps you pick the right product and the right layers underneath for the temperature of the room. But TOG isn't everything:
- A higher TOG isn't "better". The goal is to keep your child comfortable without overdressing them for the room they're in.
- Start from the room, not the weather. The measured temperature of the room your child sleeps in matters more than the season or the forecast.
- TOG doesn't measure body temperature, and on its own it doesn't guarantee your child won't sweat, or that sleep is safe. Room conditions, clothing, fit and your child's health all count.
Owli has used TOG as part of how we design products since 2016, and we show it on every sleeping product so families can choose with confidence.
TOG chart: room temperature, TOG rating and what to wear
This is Owli's general clothing guide. Read each row as a whole: room temperature, TOG and the layers underneath. Options separated by "or" are alternatives, not layers to combine.
| Room temperature | TOG | What to wear underneath |
|---|---|---|
| 24–27°C 75–81°F | 0.2 / 0.3 TOG | Short-sleeved bodysuit |
| 21–24°C 70–75°F | 0.5 TOG | Short-sleeved top and bottoms |
| 20–23°C 68–73°F | 1.0 TOG | Short-sleeved top and bottoms, or a long-sleeved bodysuit |
| 20–22°C 68–72°F | 1.5 TOG | Long-sleeved one-piece sleepsuit, or short-sleeved top and bottoms |
| 18–20°C 64–68°F | 1.5 TOG | Short-sleeved bodysuit + long-sleeved one-piece sleepsuit |
| 18–21°C 64–70°F | 2.7 TOG | Long-sleeved bodysuit + bottoms |
| 16–18°C 61–64°F | 2.7 TOG | Short-sleeved bodysuit + long-sleeved top and bottoms |
"Bodysuit" means a snap-fastened vest; "sleepsuit" means a one-piece layer worn under the sleeping bag. 0.5 TOG is part of the general guide but isn't always in the current collection.
How to read the chart
The ranges overlap on purpose. At the edges, more than one TOG and layering combination can work for the same room. 22°C, for example, doesn't call for one single TOG. Use the chart as a starting point, and if a product's own clothing guide differs from the general chart, follow the product's guide rather than combining the two.
A temperature appearing in the chart doesn't mean you should heat or cool your room to it. For babies, the NHS recommends a room of around 16–20°C. Choosing a lower TOG for a warmer room doesn't remove the need to look at the room itself.
Which TOG at which temperature?
16°C (61°F)
2.7 TOG, with a short-sleeved bodysuit plus a long-sleeved top and bottoms underneath. Below 16°C we don't suggest a TOG automatically: adjust the room first, and ask your doctor if you're unsure.
18°C (64°F)
Two rows meet here. 2.7 TOG with a long-sleeved bodysuit and bottoms, or 1.5 TOG with a short-sleeved bodysuit plus a long-sleeved sleepsuit.
20°C (68°F)
1.5 TOG with a long-sleeved sleepsuit (or a short-sleeved bodysuit plus a long-sleeved sleepsuit if the room is on the cool side), or 1.0 TOG with a short-sleeved top and bottoms or a long-sleeved bodysuit.
22°C (72°F)
1.0 TOG is a good starting point. 1.5 TOG also fits the 20–22°C row with a long-sleeved sleepsuit, or a short-sleeved top and bottoms.
23–24°C (73–75°F)
This sits between ranges: 1.0 TOG covers up to 23°C, 0.5 TOG covers 21–24°C, and 0.2/0.3 TOG starts at 24°C. Keep layers light and check your child's temperature.
24–27°C (75–81°F)
0.2 or 0.3 TOG with a short-sleeved bodysuit. In very warm rooms, a thin strappy bodysuit or just a nappy may be enough under a 0.3 TOG Sleeping Guru.
Above 27°C (81°F)
We don't suggest a TOG automatically. Cool the room if you can. The Sleeping Guru COOL is designed for 24–27°C and above, with mesh panels for extra airflow.
How to choose the right TOG in four steps
- Measure the room. Use a room thermometer where your child sleeps, away from direct sun, radiators and air-conditioning drafts.
- Choose the TOG and the product together. Use the chart as a starting point, then read the product's description and size chart.
- Decide on the layer underneath. Count bodysuits, pyjamas and anything else. Pick one of the alternatives in the chart.
- Watch your child. Check their temperature at bedtime and whenever the room changes, and adjust the layers if needed.
Every home heats and cools differently through the night, and even two bedrooms in the same city can be very different. That's why we don't recommend choosing a TOG by season alone, or because another family uses it. If you do shop by season, our sleeping bags page groups products by what each one is designed for.
What should my baby wear under a sleeping bag?
The right layer underneath is the other half of choosing the right TOG. Adding more clothes than needed can make your child hold in more heat than they need, and a TOG rating doesn't mean you can add unlimited layers inside or on top.
- Read the clothing suggestion that comes with the product's TOG.
- Rethink the layers when the room temperature changes.
- Consider how thick the clothes underneath are, and whether the size fits.
- Choosing a high TOG "because it's winter" without measuring the room.
- Pairing a high TOG with thick layers out of habit.
- Adding layer after layer because hands and feet feel cool.
- Treating a different TOG as "close enough" because the one you need is out of stock.
Safe sleep basics
Place babies on their back to sleep, on a firm, flat surface. Keep loose blankets, pillows and toys out of the sleep space, and don't use a hat indoors. Stop using arms-in swaddling when your baby shows signs of trying to roll. Choosing the right TOG doesn't replace safe sleep advice.
How do I know if my child is too hot or too cold?
Check the chest or the back of the neck. Cool hands and feet on their own don't mean your child is cold. If they're sweating or their chest feels very warm, remove a layer and check again.
Rather than drawing a conclusion from a single touch, look at the room temperature, the clothing and your child's overall state together. A touch check doesn't replace taking a temperature or medical advice. If your baby was born prematurely, has a health condition, or their temperature worries you, talk to your doctor, and don't try to treat a fever or illness by changing the TOG.
Why TOG isn't just about thickness
A product looking thick doesn't tell you its TOG. Fibre type, yarn, knit or weave, fabric finishing, the number of layers and any filling all affect insulation, as does the air trapped between the layers. That's why TOG can't be judged by touch, fabric weight or a "cotton" label.
Filling is the inner layer that helps reach the target insulation: the air held within fibre filling slows heat loss. In the Owli Sleeping Guru 1.5 TOG, for example, the inner and outer fabrics are 100% cotton and the filling is 100% polyester, so cotton touches the skin while the filling does the insulating. Insulation and moisture transport are different properties, and a TOG number doesn't describe both.
How Owli tests TOG
Owli determines the TOG values of its products with laboratory tests, and the TOG values of our Sleeping Guru and padded sleeping bags were tested in independent laboratories in Europe. A test report shows which method and conditions a sample was measured under, and the result.
You can request the TOG test report for your product from our customer service at info@owliturkiye.com. Include the product name, TOG and product code if you have it. A TOG test is about insulation; it isn't a harmful-substance test, an allergy test or a medical certificate.
Shop by TOG
- Sleeping Guru: COOL, 0.3, 1.0 and 1.5 TOG, one size 0–36 months
- Summer sleeping bags: 0.2 TOG suits and Cooltimate
- Spring and autumn sleeping bags: 1.0 and 1.5 TOG
- Winter sleeping bags: 1.5 and 2.7 TOG
TOG questions, answered
What does TOG mean?
TOG is a unit that measures a textile's resistance to heat passing through it, in other words how well it holds in warmth. The higher the TOG, the warmer the product.
What TOG should my baby wear at 22°C?
22°C (72°F) falls in more than one range. A 1.0 TOG is a good starting point; 1.5 TOG also appears in the 20–22°C row with lighter layers underneath. Follow the product's own clothing guide and check your baby's temperature.
What temperature is a 1.0 TOG sleeping bag for?
20–23°C (68–73°F), with a short-sleeved top and bottoms or a long-sleeved bodysuit underneath.
What should a baby wear under a 1.5 TOG sleeping bag?
At 20–22°C, a long-sleeved one-piece sleepsuit or a short-sleeved top and bottoms. At 18–20°C, a short-sleeved bodysuit plus a long-sleeved sleepsuit. If the product's own instructions differ, follow those, and don't stack the two.
What temperature is a 2.7 TOG sleeping bag for?
16–21°C (61–70°F). At 18–21°C, a long-sleeved bodysuit and bottoms; at 16–18°C, a short-sleeved bodysuit plus a long-sleeved top and bottoms.
Are 0.2 TOG and 0.3 TOG the same?
No, they're different measured values. Both sit in the 24–27°C range, but the products' cut and use may differ, so read the model's description too.
Is a higher TOG better quality?
No. It only means more insulation. In a warm room, a high TOG is no advantage.
Can I add up the TOG values of clothes?
Simply adding up TOG values isn't a reliable way to dress a child. How layers sit, the air between them and the fit all change the result. Use the product's own clothing guide.
Does a TOG-rated product mean my baby won't sweat?
No. TOG describes insulation only. If your child is sweating or their chest feels very warm, reduce the layers and check again.
Can I use the same TOG in summer and winter?
The measured room temperature decides, not the season. A heated room in winter and an air-conditioned room in summer can be similar.
Does TOG stay the same after washing?
Wash and dry according to the care label. How well TOG is retained after washing depends on test data for that specific product, so no blanket guarantee can be given.
What if the room is below 16°C or above 27°C?
We don't suggest a TOG automatically for these temperatures. Adjust the room first if possible, and ask your doctor for personal advice, especially for newborns, premature babies or children with health conditions.
Sources and updates. Written by Owli. Last updated 23 October 2026. The temperature and clothing chart is Owli's general product guide. These independent sources support the general information on textile measurement and baby sleep: NHS: sudden infant death syndrome and avoiding overheating; ISO 11092: thermal and water-vapour resistance of textiles; Hohenstein: textile comfort. Citing these sources doesn't mean they have approved Owli products or that a product was tested to a particular standard; each product's test method and scope are stated in its own report. This page is general information and isn't a substitute for medical advice.