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I agree with the above. However we are not trying to keep warmth in the air bed we are trying to stop the air bed becomming col from the ground. Thus we insulate under the air bed and have a good quality sleeping bag that insulates between us and the air bed - hence keeping the warmth where we are sleeping. The use of the rol up mats, in our experience does make a difference especially if there has been considerable rain and the the ground is cold and damp.

Cheers

winni,

The point I was making was that we have never ever been cold, not even in the worst weather (although I admit our trips are sofar limited to May to September inclusive). I do understand what we are trying to acheive and am basing what we do off experience and how we have found it to be.

As the under airbed roll mats (insullation if you like) are limited exclusively to the bedroom pods we have a degree of seperation from the cooling effect on the rest of the tent by being within the bedroom tent within a tent. The area of the air beds that are effectively open to the air in the tent is small with the vast majority of it being insulated underneath by the roll mats and on top by a layer of good sleeping bag and the bit that overhangs the side of the air beds.

Maybe its all in the mind but when we use the roll mats under the airbeds we find it to be significantly warmer than when not using them.

Also in the case of our youngsters it is simpler to insulate undereath the airbeds as anything put on top (including them somtimes) tends to end up on the floor weather attached to it or not.

Any insulating layer below the body will keep the body warmer but that layer must itself be insulatedfrom the cold ground

for example..

ground. foot print. bedroom pod SIG ( these are all cold)

picnic blanket. roll mat. wollen blanket. ( these are insulators)

air bed , SIM. bottom of sleeping bag.( these are for comfort )

duvet, sheets and blankets, top of sleeping bag ( these are for warmth)

im no scientist but over the years camping in temperatures from 28 degrees to -10 degrees these simple rules have kept me warm and or comfortable .

And for the record ive woken to find the previous nights hot drink frozen solid in the mug and been lovely and warm through the night myself.