Quick Answer

Choose a TOG 1 sleep sack for warmer rooms (24–27°C / 75–80°F) and a TOG 2.5 for cooler rooms (18–21°C / 65–70°F). If your baby's room fluctuates, layer a TOG 1 over lighter pajamas or use a TOG 2.5 with lighter clothing underneath. Always check your baby's temperature by feeling their chest or back, not their hands or feet.

Understanding TOG Ratings

TOG (Thermal Overall Grade) measures a fabric's insulation. A higher TOG means more warmth. Sleep sacks are rated so you can match them to room temperature and season. TOG 1 is a lighter option for warmer months or heated rooms, while TOG 2.5 is a heavier option for cooler months or air-conditioned spaces.

You don't need to buy every TOG. Many parents use a TOG 1 for most of the year and switch to TOG 2.5 only in winter. If your baby runs warm, you might prefer TOG 1 even in cooler months, layering with a long-sleeve onesie.

How to Choose Based on Room Temperature

A simple rule: if the room feels comfortable for you in a short-sleeve shirt, a TOG 1 sleep sack is likely enough. If you'd want a sweater, your baby probably needs a TOG 2.5.

Always feel your baby's chest or back to check if they're too warm or cool. Damp hair, flushed cheeks, or rapid breathing can signal overheating. Cool hands or feet are normal and not a reliable indicator.

Seasonal and Layering Tips

In summer or in warm climates, a TOG 1 sleep sack alone is often sufficient. In winter, pair a TOG 2.5 with a cotton footed pajama for extra warmth without adding loose blankets.

If you're unsure between the two, start with a TOG 1 and add a layer underneath if needed. You can always adjust clothing, but you can't remove insulation from a sleep sack.

Trade-offs at a Glance

  • TOG 1: Lighter and more versatile: Suitable for warmer rooms and most of the year. If your baby runs warm, this is the safer choice to prevent overheating. You can always add a layer underneath. Choose TOG 1 if your room is above 24°C or your baby tends to sweat.
  • TOG 2.5: Warmer for cooler nights: Provides more insulation for winter or air-conditioned rooms. But if the room is too warm, your baby may get sweaty and uncomfortable. Choose TOG 2.5 only if your room is below 21°C and your baby sleeps cool.
  • Layering flexibility: With a TOG 1, you can adjust warmth by adding or removing pajama layers. With a TOG 2.5, you have less flexibility because the sleep sack itself provides more insulation. If your room temperature fluctuates, a TOG 1 with a layer underneath gives you more control.

Product Facts

  • Cormorant - CloudBlend™ Sleep Sack TOG 1: Cormorant - CloudBlend™ Sleep Sack TOG 1 is a wearable blanket in a warm, earthy brown, made from CloudBlend™ fabric. This TOG 1 sleep sack is ideal for warmer rooms or summer nights, keeping your baby cozy without extra bulk. The earthy brown color is gender-neutral and easy to match with any pajama.
  • Galah - CloudBlend™ Sleep Gown: Galah - CloudBlend™ Sleep Gown is a wearable blanket in a true dusty pink, made from CloudBlend™ fabric. A sleep gown offers easy diaper access and allows freedom of movement. It's a great alternative to a sleep sack for babies who like to kick, and the dusty pink adds a soft touch to bedtime.

Which One Fits Your Baby?

Best for

  • Parents who keep the nursery between 24–27°C or in warm climates
  • Babies who tend to run warm or sweat easily

Not for

  • Cold winter nights in poorly heated rooms (choose TOG 2.5 instead)
  • Parents who prefer a single sleep sack for all seasons (consider layering with TOG 1)