The Lightest, Most Breathable Sleep Sack for Safe Sleep — Swaddelini (Only 0.2 TOG)

Sleep safety is the number one priority at Swaddelini.

That’s why every Swaddelini is designed to keep your baby cool, comfortable, and safe, even on warm nights.

What is Thermal Overall Grade (TOG)?

TOG (Thermal Overall Grade) is a standardized measurement that indicates how much warmth and insulation a fabric provides. The higher the TOG number, the warmer the fabric; the lower the TOG, the more breathable and lightweight it is.

For baby sleep sacks, a lower TOG rating (like 0.2–0.5) is ideal for warmer environments, as it helps prevent overheating while still providing comfort. Understanding TOG makes it easier to dress your baby appropriately for safe sleep.

Why Does TOG Matter for Safe Sleep?

Temperature is a key factor in safe infant sleep. We rigorously test all our products for TOG.

Swaddelini sleep sacks range from 0.2 to 0.34 TOG, making them among the lightest and most breathable baby sleep sacks available.

Our Air Light Swaddelini has a TOG of just 0.21, helping your baby stay cool while still feeling gently hugged for comfort and security. Because babies can’t tell us when they’re too warm, a lightweight, breathable sleep sack helps regulate their temperature naturally.

How do I choose the right sleep sack for my baby, based on my home?

If they are sleeping in 61°F–68°F (Cool room), layer two cozy pajamas under your Swaddelini Original or Bamboo for warmth.

If they are sleeping in 68°F–75°F (Comfortable room), any Swaddelini works well. At 68°F, add a fleece pajama set; closer to 75°F, just a diaper is enough.

Or, at 75°F–81°F (Warm room), use the Air Light Swaddelini, the lightest, most breathable sleep sack with a TOG of 0.21. If the room is above 81°F, do not use a sleep sack or swaddle to avoid overheating.

Our Air Light Swaddelini is the lightest on the market with a TOG of 0.2.

How can I check if my baby is too cold or too warm?

Touch the back of your baby's neck with two fingers. If it feels sweaty or damp, remove a layer. If it feels cool, add a pajama layer before putting the Swaddelini back on.

Why does safe sleep start with Swaddelini?

From our ultra-light 0.2 TOG Air Light Sleep Sack to our gently compressive knit design, every detail is crafted to help your baby sleep safely and soundly.

Learn more about Swaddelini sleep sacks and get answers to your questions on our FAQ page.