When we started this company, we did plenty of research in order to decide which material to use for our onesies; viscose from bamboo was clearly the best choice for so many reasons:
Soft - Our material drapes like silk and has a butter-soft feel. As a bonus, our material is blended with spandex so it stretches easily, making dressing any baby frustration free.
Cool - Our material wicks naturally. That means it pulls moisture away from the body, making it even more comfortable to wear vs. traditional non-wicking fabrics. This is especially true for babies living in warmer climates. As parents ourselves, we've found this helps to mitigate the chances of 'prickly heat rash'.
Sustainable - Bamboo is one of the fastest growing plants on earth - growing up to 1 meter a day! Bamboo can grow with rain water and no need for heavy irrigation or use of pesticides like other plant based fabrics.