Quick answer

Choose a TOG 0.5 SleepSack for warmer rooms (24–27°C / 75–80°F) and a TOG 1.0 for cooler rooms (21–24°C / 70–75°F). Fabric choice—cotton vs. microfleece—adds a comfort layer but does not change the TOG rating.

What TOG means for baby sleep sacks

TOG (Thermal Overall Grade) measures a fabric's insulation. The higher the TOG number, the warmer the sack. For babies, the right TOG prevents overheating—a known SIDS risk factor—while keeping them cozy. Always pair your SleepSack with a properly fitted onesie or pajamas, not loose blankets.

Cotton vs. microfleece: more than just feel

Both TOG 0.5 and TOG 1.0 SleepSacks come in cotton and microfleece versions. Cotton is breathable and gentle on sensitive skin, ideal for year-round use in temperature-controlled homes. Microfleece adds a plush, cozy feel that some babies find soothing, but it does not change the TOG warmth—it's a texture preference, not a warmth upgrade.

Your TOG decision rules

  • Room temperature 24–27°C (75–80°F): Choose a TOG 0.5 SleepSack. Pair with a short-sleeve onesie or lightweight pajamas. The cotton version (product ID 81139) is especially breathable for warmer conditions.
  • Room temperature 21–24°C (70–75°F): Choose a TOG 1.0 SleepSack. Pair with a long-sleeve onesie or lightweight footed pajamas. The microfleece version (product ID 81151) adds a soft, cozy feel. Check your nursery temperature with a reliable room thermometer before choosing.
  • Room temperature below 21°C (70°F): A TOG 1.0 SleepSack may still work if you layer with warmer pajamas, but HALO does not currently offer a higher TOG option. Consider adding a cotton onesie underneath and monitor your baby's chest for warmth. If your room is often below 21°C, you may need to look for a higher-TOG sack from another brand or adjust your heating.

Product facts at a glance

  • Wearable Blanket 100% Cotton TOG 0.5: HALO SleepSack Wearable Blanket 100% Cotton TOG 0.5 Breathable cotton makes this a great everyday choice for warmer nurseries or year-round use in climate-controlled homes.

    Wearable Blanket 100% Cotton TOG 0.5

    Wearable Blanket 100% Cotton TOG 0.5

  • Wearable Blanket Micro-Fleece TOG 1.0: HALO SleepSack Wearable Blanket Micro-Fleece TOG 1.0 The plush microfleece fabric adds a soft, cozy feel that many babies find comforting in cooler rooms.

    Wearable Blanket Micro-Fleece TOG 1.0

    Wearable Blanket Micro-Fleece TOG 1.0

Who should choose which

Best for

  • Parents in warm climates or homes that stay above 24°C (75°F) should choose a TOG 0.5 SleepSack.
  • Parents in cooler climates or homes that dip to 21–24°C (70–75°F) should choose a TOG 1.0 SleepSack.

Not for

  • Babies who sleep in rooms consistently below 21°C (70°F) may need a higher TOG rating than HALO currently offers.