Baby Sleep Bag TOG Ratings Explained: 0.5, 1.0 and 2.5 TOG
By LOULOU LOLLIPOP - US | Designed to Love, Made for Joy ... | Published: 2026-10-13
Category: 구매 가이드
TOG ratings tell you how warm a sleep bag is, not how thick it feels. Match 0.5, 1.0 or 2.5 TOG to your nursery temperature, then check fit.
Quick answer
Match the TOG rating to the temperature of the room your baby sleeps in, not to the season on the calendar. Use 0.5 TOG for 75-81°F rooms, 1.0 TOG for 69-75°F, and 2.5 TOG for 61-68°F. Buy one bag per temperature range you actually live in, and re-check the fit as your baby grows.
What a TOG rating actually measures
TOG stands for thermal overall grade. It measures how much warmth a garment holds in, which is why a thin muslin bag can be rated warmer than a bulky quilted one. A 0.5 TOG bag traps very little heat; a 2.5 TOG bag traps much more. The number tells you the intended room temperature range, not how thick the fabric feels in your hand.
That distinction matters because babies cannot push a blanket off or pull one up. A sleep bag gives them one fixed layer of warmth all night, so choosing the right TOG is really about choosing the right layer for the room. If your nursery swings between two ranges, you need two bags, not one compromise.
The three ratings and the rooms they fit
0.5 TOG is the lightest rating. It suits 75-81°F: summer nights, top-floor bedrooms, and homes without central air. When a 1.0 TOG starts to feel like too much, this is the bag to reach for.
1.0 TOG is the year-round weight. It fits a 69-75°F nursery and covers roughly nine months of the year for many families. It is warm enough for a typical night and light enough that a baby is less likely to wake up overheated.
2.5 TOG is the winter weight. It is rated for a cold 61-68°F nursery, for the rooms that never quite warm up. A textured weave adds loft that holds warmth without the bulk of a heavier bag.
How fabric changes the feel at the same TOG
Two bags can share a TOG rating and still feel different against the skin. A smooth shell over TENCEL Lyocell gives a cool, drapey hand. A waffle knit traps a thin layer of air against the skin, so it reads slightly warmer and more textured at the same rating. A muslin bag in bamboo viscose is the airiest option, which is why it is the natural pick for the lightest rating.
None of these differences change the temperature range the bag is rated for. They change what your baby feels when they wear it, and how the bag handles a warm sleeper or a room with poor airflow. If your baby runs hot, the airier fabric at the same TOG is the safer starting point.
Using a TOG chart without overthinking it
A tog chart for baby sleepwear works as a starting point, not a verdict. Put a thermometer in the nursery and read it at the same time each evening, because room temperature drifts overnight. Then dress your baby in a simple base layer under the bag and check the back of the neck after twenty minutes. Warm and dry means the setup is right. Damp or flushed means drop a TOG or lighten the base layer.
If you are deciding between 1.0 TOG vs 2.5 TOG for a room that sits right at 68-69°F, start with 1.0 TOG and a warmer base layer. You can always add the heavier bag later. Overheating is harder to fix at 3 a.m. than a slightly cool baby who simply needs another layer.
Decision rules for picking a TOG
- Read the room first: Put a thermometer where your baby sleeps and note the range across the night, not just at bedtime. If the room stays between 69 and 75°F, a 1.0 TOG bag is your default.
- Buy for the range you live in, not the season: A calendar month does not tell you the temperature of your nursery. A top-floor room in June can run hotter than a ground-floor room in October. Two bags covering two ranges beat one bag that is wrong half the year.
- Check the back of the neck: After twenty minutes of sleep, warm and dry means the TOG is right. Damp, flushed or sweaty means drop a rating or lighten the base layer. Adjust the layer under the bag before you buy a new bag.
- Size for the body in front of you: A bag that is too long can ride up over the face, and one that is too tight restricts the legs. Follow the size range for your baby's weight and height rather than buying ahead. Replace the bag when the neck opening gaps or the toes press the seam.
How these bags map to the ratings
- Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - She Shoots She Scores: 1.0 TOG sleep bag in TENCEL Lyocell, described as the year-round weight for a 69-75°F nursery and the everyday workhorse of the line. This is the bag most families will use about nine months of the year, so it is the sensible first purchase if you only buy one.
- Waffle Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Denim Blue: 1.0 TOG waffle knit sleep bag in TENCEL Lyocell, same year-round warmth as the flagship bag but with a waffle weave that traps a thin layer of air against the skin. Choose this over the smooth version if you want a little more texture and a slightly warmer feel at the same 1.0 TOG rating.
- Waffle Baby Sleep Bag 2.5 TOG in TENCEL™ Lyocell - Coconut Milk: 2.5 TOG waffle sleep bag in TENCEL Lyocell, rated for a cold 61-68°F nursery, with a textured weave that adds loft without the bulk of a heavier bag. This is the bag for unheated rooms and deep winter, and the loft means you get the warmth without a stiff, heavy feel.
- Baby Muslin Sleep Bag 0.5 TOG in Tanboocel® Viscose from Bamboo - Hedgehog Forest: 0.5 TOG muslin sleep bag in Tanboocel viscose from bamboo, the lightest bag in the line, rated for 75-81°F. Sticky nights need fabric that breathes rather than more fabric, so this is the summer and no-central-air choice.
Who each rating suits
Best for
- Babies in a 69-75°F nursery who need one bag for most of the year (1.0 TOG)
- Babies in a 75-81°F room, a top-floor bedroom or a home without central air (0.5 TOG)
- Babies in a 61-68°F room or an unheated winter nursery (2.5 TOG)
- Parents who want a warmer-feeling option at the same rating (waffle knit 1.0 TOG)
Not for
- Rooms that swing more than about 6°F overnight, where one rating cannot cover both ends
- Parents looking for a single bag to handle both summer and deep winter
- Babies who have outgrown the weight or height range for the size, even if the TOG is correct
