Sleep Sack TOG Guide: What the Brand Charts Don't Agree On

At 68°F - squarely inside the range nurseries drift into as fall starts - Kyte Baby's chart says 2.5 TOGTOGA wearable-blanket warmth rating. 0.5 TOG is lightweight (summer/warm rooms), 1.0 TOG is all-season, 2.5+ TOG is for cold rooms. Match to the room temperature, not the season outside.. Love to Dream's chart, at that same reading, allows 1.0, 1.5, or 2.5. HALO's chart spans 1.0 to 3.5, because 68°F sits in two of its bands. Three brands, one thermometer, a full TOG step of disagreement.

TOG itself isn't mysterious. It's a laboratory-measured warmth rating: a thermal mannequin tests how much heat a fabric traps, and that number gets stamped on the sack. What doesn't exist is an independent body translating that lab number into a room-temperature chart. Each brand writes its own, and the bands don't line up at the edges.

Three charts, one thermometer

Here's what each brand's own published chart assigns at the same room temperatures.

What the table shows: the three brands agree only inside two bands - 69-73°F at 1.0 TOG and 61-67°F at 2.5 TOG. Everywhere else, at least one brand's own published range spans two different TOG values for the same room temperature.

Where the charts agree

Two bands aren't up for debate:

• 69-73°F → 1.0 TOG. Kyte, Love to Dream, and HALO's ranges all include this band.
• 61-67°F → 2.5 TOG. The same three-way overlap, at the cold end.

If your nursery sits in either range, the chart shopping is over.

Where they don't, and what to do

The disagreement clusters at two boundaries: 67-69°F and 73-75°F. At 68°F, Kyte has already moved to 2.5 while Love to Dream and HALO both still allow 1.0. At 74°F, Kyte drops to 0.5 while Love to Dream still allows 1.0 and HALO spans as high as 2.5.

In either boundary zone, go one TOG lighter than the higher chart suggests, add a layer underneath instead, and check your baby rather than the thermostat. Kyte's own guidance is specific about where to check: the neck, back, or stomach for sweat or cold - not the hands or feet, which run cooler regardless of room temperature.

The AAP's rule, restated: dress your baby in one layer more than you're wearing, and watch for sweating, a hot chest, or flushed skin as the sign to remove a layer. That's a total-outfit rule, not a sack-only one.

What goes under the sack

TOG describes the sack. What's underneath it changes the total warmth, which is exactly what the Lullaby Trust points to when it declines to publish its own chart. Read as a consensus rather than a standard, here's what the same three charts imply for underlayers:

This is a reading of what the brands' own guidance implies, not a published standard - none of the three charts states an underlayer rule this explicitly.

The chart nobody will publish

The Lullaby Trust, the body parents most often cite for room temperature, recommends 16-20°C (61-68°F) for a baby's room. It also says, directly, that families ask it for a chart matching room temperature to clothing, layers, and TOG - and it doesn't publish one, because the heat trapped between layers changes a product's effective warmth too much to reduce to a single number.

That's the honest ceiling here: there is no independent TOG-to-temperature standard. The brands publish their own charts, the charts disagree at the boundaries, and the one organization parents look to for room temperature guidance says a universal chart isn't something it can responsibly produce. Two consensus bands and a chest check are what's left once you strip out each brand's marketing incentive to round in its own favor.

Which sack, then

Three options from the charts above; current availability is on each linked page:

• Love to Dream Swaddle Up → carries a 1.0 TOG rating - the band every chart agrees on at 69-73°F.
• HALO SleepSack → is 100% cotton at 1.5 TOG, a middle option for rooms that hover across the 68-72°F boundary.
• Kyte Baby's bamboo sleep bags run the full 0.5-2.5 lineup referenced above; see our swaddle and sleep sack picks for current availability and sizing.

For keeping the room itself in the target band before you even open a TOG chart, see our room temperature guide. If your baby is still swaddled, here's when to make the switch to a sack in the first place. And for the overheating standard behind the one-layer rule above, the full AAP safe sleep guidelines cover it in context.

What TOG for a 68 degree room?

There's no single answer - it's the exact boundary where the three major charts disagree. Kyte assigns 2.5 TOG at 68°F; Love to Dream and HALO both still allow 1.0. The safer default in that gap is 1.0 TOG with a long-sleeve layer underneath, plus a chest check rather than trusting one brand's line.

Can a baby wear a 2.5 TOG sack in summer?

Not by any chart here - all three brands cap 2.5 TOG at their coldest bands (61-68°F). In a warm room, a 2.5 TOG sack risks overheating, which the NHS and AAP both flag as a SIDSSIDSSudden Infant Death Syndrome: unexplained death of an otherwise healthy infant under 1, usually during sleep. The AAP's ABCs of safe sleep (Alone, on Back, in a Crib) cut the risk by more than half. risk factor. Match the TOG to the room, not the season on the calendar.

Do you put clothes under a sleep sack?

Yes, generally - the three charts' own guidance implies a bodysuit or pajama underneath depending on the room band (see the underlayer table above). Kyte specifically suggests dropping to just a lightweight bodysuit once the room passes 75°F, and reserves a long-sleeve pajama layer for the coldest, highest-TOG band.