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Anti-condensation underlay, starts at £45. A cheaper alternative is to get a foam camping mat – often dark green but I’ve also seen slightly more expensive ones in light blue –  from a pound store or other place and cut it up into smaller pieces, for example, the size of envelopes or similar triangles. Or use some other kind of foam as it will have to be sufficiently thick to allow air flow through the open spaces, not get squished too much by the mattress.

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