We get this one a lot: “I didn’t even know there were TOG-rated onesies — so what TOG is my baby’s Wondersuit?”

Here’s the honest answer, and it surprises most parents: Bonds doesn’t give its baby suits a TOG rating. Not the Wondersuits, not the cotton Zippy suits, not the classic bodysuits. So there’s no official number to look up — which is exactly why dressing baby for sleep in them can feel like guesswork.

That doesn’t mean they’re unsafe or unusable. It just means you’re estimating. Consider this your Bonds TOG guide: let’s make that estimate a good one.

So roughly what TOG is a Bonds Wondersuit?

Since Bonds doesn’t rate them, the best we can do is a working estimate based on fabric weight. As a rough guide:

• A standard cotton Wondersuit is lightweight — call it 0.2–0.5 TOG.
• A single-layer cotton bodysuit or Zippy (the thin, everyday ones) sits somewhere around 0.2 TOG — a light base layer.
• A padded Wondersuit or Cozysuit (the quilted, brushed winter versions) is warmer again — but this is where estimating gets genuinely risky. There’s no reliable number, and the gap between “a bit warmer” and “a lot warmer” matters at 3am.

Treat these as ballpark figures, not facts. The whole reason TOG ratings exist is that “it feels about the same” is unreliable — two suits that look identical folded can keep your baby quite differently warm.

How to use a Bonds Wondersuit for sleep

If a Wondersuit (or any Bonds suit) is what’s clean and in the drawer, here’s how to use it sensibly:

• Treat a standard cotton Wondersuit as roughly a 0.2 TOG layer when you’re reading a TOG chart. So in a mild 21–23°C room, a cotton Wondersuit under a 1.0 TOG sleeping bag is a reasonable pairing.
• When in doubt, go one step lighter and check your baby. Feel their chest or back of neck — warm means you’ve got it right; cool hands are normal and not a sign they’re cold.
• Never stack extra layers “just in case.” Red Nose Australia warns that overheating is a real risk, and guessing high is how it happens.

Or take the guesswork out entirely

The reason we started making TOG-rated rompers is this exact frustration: parents dressing their baby in a lovely Wondersuit with no idea how warm it actually is.

A rated romper is the same idea as a Wondersuit — a soft, footed, all-in-one base layer — but with the warmth printed on the tag. A 0.2 TOG romper for warmer rooms, a 1.0 TOG romper for cooler ones, both in breathable organic cotton. Pair one with a TOG-rated sleeping bag and the maths finally adds up — no estimating, no “it feels about right.”

They come in newborn sizing (0–3 months), which is when getting sleep layers right matters most. Even owning one rated layer is worth it: it teaches you what “0.2 TOG” actually feels like, so you can judge your other suits against something real.

Quick Questions

Are any Bonds products TOG rated?

Bonds does sell some TOG-rated sleeping bags, but its everyday suits, Wondersuits and bodysuits generally aren’t rated. Always check the individual tag.

What TOG is a padded Bonds Wondersuit or Cozysuit?

There’s no official number, and honestly the estimates get shaky here — quilted and brushed fabrics vary a lot. If you’re using one for sleep, treat it as a warm layer, skip extra layers underneath, and check baby’s chest after the first half hour. For cold rooms, a rated sleeping bag over a light suit is the more predictable combination.

Is a Bonds Wondersuit warm enough for winter?

On its own, usually not for a cold room — a lightweight cotton suit is a base layer, not the main source of warmth. In winter the warmth should come from a correctly TOG-rated sleeping bag over the top. Our winter guide has the room-by-room combinations.

What can I use instead of guessing?

A TOG-rated base layer, and — if you want the room temperature side solved too — a thermometer that predicts the overnight low and tells you what to dress baby in.

Not too hot, not too cold — but with an unrated suit, you’re guessing at “just right.” A number on the tag takes the guessing away.