In a nutshell
That depends on the season and the room temperature.
Cotton is nice all year long. We’d recommend teddy for cold autumn and winter weather.
Tencel has a wonderfully cooling effect during the hot summer months.
You should also take a closer look at the TOG charts for Piep and Mini. For every room temperature they indicate which version of the swaddle sleeping bag should be used and what your little one can wear:
Both the Puckababy Piep and Mini are available in cotton, teddy or Tencel.
In more detail
The cotton swaddle sleeping bag is suitable for any temperature. If the room is hot a onesie is warm enough for this sleeping bag. For colder nights add a layer such as the Tencel sleep suits.
Does the room cool down a bit faster on cold nights (14-18°C)? Then the Teddy winter version will keep your child nice and warm. In this case a onesie will suffice: the teddy fabric is warm enough so there’s no need to add an extra layer.
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Did you know?
TOG ratings and temperature, what do I have to look for?
What clothes can my child wear in the swaddle sleeping bag?
How can I swaddle my child safely in warm weather?