Quick answer

Choose a TOG 1 sleep sack for warmer rooms or layering, and a TOG 2.5 for cooler rooms or standalone use. Both CloudBlend options offer a safe, cozy alternative to loose blankets.

Why TOG matters for safe sleep

TOG (Thermal Overall Grade) measures a fabric's insulation. A higher TOG means more warmth. Using the right TOG helps prevent overheating or chilling, both of which are linked to unsafe sleep conditions. The American Academy of Pediatrics recommends a firm, flat sleep surface and no loose bedding—a wearable blanket like a sleep sack eliminates that risk while keeping baby comfortable.

Room temperature and layering

Room temperature is the main factor when picking a TOG. A TOG 1 sack works well in rooms 24-27°C (75-80°F) and can be layered over a short-sleeve onesie. A TOG 2.5 sack suits rooms 18-21°C (65-70°F) and typically needs only a long-sleeve onesie underneath. In between, you can adjust with clothing layers rather than switching sacks. Always check baby's neck or chest for warmth, not hands or feet.

Decision rules for choosing your CloudBlend Sleep Sack

  • Check the room temperature: Use a nursery thermometer to measure the actual temperature near the crib. Do not guess based on your own comfort. A consistent room temperature reading removes guesswork.
  • Match TOG to temperature range: For rooms 24-27°C (75-80°F), choose a TOG 1 sack. For rooms 18-21°C (65-70°F), choose a TOG 2.5 sack. If the room falls between these ranges, adjust baby's clothing layer rather than buying a different sack.
  • Consider layering and season: In transitional seasons, you can use a TOG 1 sack with a long-sleeve onesie or a TOG 2.5 sack with a short-sleeve onesie. Avoid adding extra blankets or heavy clothing inside the sack. Layering lets one sack work across multiple seasons.
  • Check baby's temperature: Feel baby's chest or the back of the neck. If it feels sweaty or hot, remove a layer or switch to a lower TOG. If it feels cool, add a layer or move to a higher TOG. Always use touch, not appearance, to judge comfort.

Product facts

  • Teddy - CloudBlend™ Sleep Sack TOG 2.5: Teddy - CloudBlend™ Sleep Sack TOG 2.5 features our luxurious CloudBlend™ fabric, a wearable blanket that keeps baby cozy without sacrificing safety. The higher TOG 2.5 rating makes this ideal for cooler nurseries or winter use, reducing the need for extra blankets.

    Teddy - CloudBlend™ Sleep Sack TOG 2.5

    Teddy - CloudBlend™ Sleep Sack TOG 2.5

  • Elwyn - CloudBlend™ Sleep Sack TOG 1: Elwyn - CloudBlend™ Sleep Sack TOG 1 features our luxurious CloudBlend™ fabric, a wearable blanket that keeps baby cozy without sacrificing safety. The lighter TOG 1 rating suits warmer rooms or layering over pajamas, giving you flexibility as seasons change.

    Elwyn - CloudBlend™ Sleep Sack TOG 1

    Elwyn - CloudBlend™ Sleep Sack TOG 1

Who should choose which TOG

Best for

  • Parents in warmer climates or heated homes who need a lightweight sleep sack for year-round use (TOG 1).
  • Parents in cooler climates or unheated nurseries who want a single, cozy sleep sack for winter nights (TOG 2.5).

Not for

  • Parents who need a sleep sack for a baby under 8 weeks or under 7 lbs—check weight guidelines first.
  • Parents who prefer a sleep sack with built-in feet or leg openings—these CloudBlend sacks are traditional wearable blankets.