The heat issue may have been solved by some manufacturers. During the extreme heat we slept on a foam mattress at my daughter’s house. It was a cheap one but labelled as cool something or other. “Yeah, sure” we thought. In fact it was no hotter than our own conventional John Lewis own brand £800 one. We both slept well despite the warmth of each evening.
I would still choose a conventional mattress over foam as I prefer natural fibres wherever possible but foam heat may not be the issue it once was?
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