It is bedtime, the nursery thermometer says 68°F, and you are holding two sleep sacks with different numbers on the label, wondering which one will keep your baby warm without overheating. This sleep sack TOG chart turns the label into a plain choice: what the TOG number means, which rating brands match to which room temperature in Fahrenheit, and what to put on underneath.
Quick answer: which TOG for your room?
- Measure the room where your baby sleeps; go by the thermometer, not the season.
- Use the chart of the sack you own. HALO, for example, lists 0.5 TOG for 75 to 77°F, 1.0 for 72 to 75°F, 1.5 for 68 to 72°F, 2.0 for 64 to 68°F and 3.0 for 61 to 64°F.
- Layer lightly underneath. The AAP says a baby only needs one more layer than you would wear in the same room.
- Check your baby, not just the label: sweating, a hot chest or flushed skin mean they are too warm.
What a TOG rating means
TOG stands for Thermal Overall Grade. HALO describes it as a measure of how well a fabric traps warm air: the higher the TOG, the warmer the sleep sack. A 0.5 TOG sack is a thin layer for warm rooms; a 2.0 or higher sack is padded for cool rooms.
Two things to know before you trust any chart. First, the AAP does not publish a TOG chart or an ideal room temperature; its advice is to avoid overheating. Second, each brand sets its own temperature bands, so the same TOG can come with a slightly different range from one maker to the next.
Sleep sack TOG chart in Fahrenheit (HALO)
| TOG | Room temperature (HALO) | HALO’s label |
|---|---|---|
| 0.5 TOG | 75 to 77°F | Summer / warm rooms |
| 1.0 TOG | 72 to 75°F | Year-round / mild rooms |
| 1.5 TOG | 68 to 72°F | Spring and fall |
| 2.0 TOG | 64 to 68°F | Cooler rooms |
| 3.0 TOG | 61 to 64°F | Winter / cold rooms |
HALO’s own pages are not always consistent: the cotton 0.5 TOG wearable blanket page shows the chart above, yet also says the product is “perfect for 68°F to 77°F.” When a page gives two answers, the narrower chart is the safer guide, and your baby’s chest tells you the rest.
How other brands describe the same ratings
- Kyte Baby describes its 0.5 TOG for nursery temperatures “in the mid to upper 70s,” 1.0 TOG for “the low 70s” and 2.5 TOG for rooms that “hover in the 60s.”
- Love to Dream lists its 1.0 TOG Swaddle UP for rooms of 68 to 75°F, a wider band than HALO gives its 1.0 TOG. Our Love to Dream Swaddle UP review has the full specs.
- The takeaway: charts agree on the direction (lower TOG for warmer rooms) but not on the exact cut-offs, so treat any number as a starting point.
What to put on under a sleep sack
The AAP rule of thumb: your baby only needs one more layer than you would wear to be comfortable in the same room. HALO puts it the brand’s way: dress your baby the way you would dress yourself for sleep, then swap the blanket for a SleepSack.
- Warm room with a 0.5 TOG sack: a short-sleeve bodysuit is often enough.
- Mild room with a 1.0 or 1.5 TOG sack: a long-sleeve bodysuit or light pajamas.
- Cool room with a 2.0 TOG or warmer sack: footed pajamas underneath.
- Indoors, skip the hat: the AAP advises against hats for sleeping babies once you are home from the hospital.
- Never add a loose blanket on top of a sleep sack.
These layer examples are a general guide, not an AAP chart. For cold nights and drafty rooms, our guide on how to dress a baby for sleep in winter goes room by room.
Step by step: choosing the right TOG tonight
- Check the temperature in the room where your baby sleeps, about an hour before bedtime.
- Find that temperature on the chart of the sack you own (on the label or the maker’s website).
- If you are between two ratings, pick one and adjust the layer underneath rather than adding blankets.
- After your baby has settled, feel the chest or the back of the neck. It should feel warm, not hot or sweaty; hands and feet often feel cooler and are not a good guide.
- If your baby feels hot, sweaty or looks flushed, remove a layer or switch to a lower TOG.
- Re-check when the weather turns or the heating or air conditioning changes.
Sleep sacks and swaddles that list a TOG
- For the swaddling weeks: our best swaddles for newborns compares HALO (1.5 TOG), Love to Dream (1.0 TOG) and SwaddleMe (1.0 TOG).
- After swaddling: the HALO Easy Transition SleepSack is 1.5 TOG with sleeves.
- Swaddle with wings in a 1.5 TOG cotton: see our HALO SleepSack Swaddle review.
- Arms-in 1.0 TOG cotton wrap: see our SwaddleMe Original Swaddle review.
What to avoid: weighted sleep sacks and weighted swaddles (the AAP says they are not safe), loose blankets, hats indoors, sleep positioners and wedges. Swaddles stop at the first signs of rolling; our when to stop swaddling guide explains the switch.
The rest of the nursery matters too:
- Temperature, light and noise: our sleep environment guide.
- The full checklist: our safe sleep guide.
- More on sleep: all of our baby sleep guides.
Related: HALO SleepSack wearable blanket review: sizes and TOG.
Related: Woolino sleep sack review: sizes, TOG and warmth.
Related: sleep sack for toddlers: sizes 2T to 4T and when to stop.
Related: HALO vs Woolino sleep sack: TOG, sizes and warmth compared.
When to talk to your doctor
- Your baby has a fever, or feels hot and seems unwell, even after you remove a layer.
- Your baby is sweating heavily, breathing fast or looks unusually flushed or pale.
- Your baby was born early or has a health condition, and you are unsure how warmly to dress them.
- You notice breathing pauses, color changes or anything else that worries you.
Related: sleep sack vs swaddle: which one your baby needs now.
Frequently asked questions
68°F sits on the border between two of HALO’s bands: 1.5 TOG for 68 to 72°F and 2.0 TOG for 64 to 68°F. Kyte describes its 2.5 TOG for rooms in the 60s. Use the chart of your own sack, dress your baby in light layers and check the chest or back of the neck for sweat.
TOG stands for Thermal Overall Grade, a measure of how warm a fabric is. The higher the TOG, the warmer the sleep sack. Brands set their own temperature ranges for each rating, so follow the chart of the sack you use. The AAP does not publish a TOG chart; it advises avoiding overheating.
The AAP says a baby only needs one more layer than you would wear in the same room. In practice that is often a short-sleeve bodysuit under a light sack in a warm room, and long sleeves or footed pajamas under a warmer sack in a cool room. Skip hats indoors and never add a loose blanket.
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Sources
- HALO: SleepSack Wearable Blanket 100% Cotton TOG 0.5 (product page with TOG Temperature Guide), checked October 24, 2026
- Kyte Baby: The Take On TOG, checked October 24, 2026
- Love to Dream: Swaddle Up 1.0 TOG Cotton (US product page), checked October 23, 2026
- AAP, HealthyChildren.org: How to Keep Your Sleeping Baby Safe (updated September 11, 2026)
- AAP, HealthyChildren.org: Swaddling: Is It Safe?
This page is general information based on manufacturer information and official guidance, not medical advice. Always follow the manufacturer’s instructions and talk to your pediatrician about your baby’s sleep and safety.