I think I'd want to try them out, for a night, not just a few minutes, but then I'm not a spring chicken anymore, who used to be able to sleep on a floor with just a duvet. If I did that now, I wouldn't be able to move, let alone get up.
I'd be interested in their absorption of damp in the air also, but they do look lovely and match the belltent vibe.
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Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.