Are bamboo sleep sacks worth the higher price over cotton?

Bamboo (rayon/viscose from bamboo) is repeatedly praised by community reviewers for buttery softness and temperature regulation, which parents of warm-running or eczema-prone babies appreciate. However, multiple specialist-subreddit threads argue premium brands like Kyte are 'not worth the hype' versus cheaper bamboo dupes, so the value case depends on how much the softness matters to you.