In a word, Thermarest! These are the best invention since someone clever though "ooh why don't I put something soft between me & this rock I'm sleeping on!!) I've had one for 4 years now & they are just the best - loads of friends have bought them on my recommendation!!
They cost about 50 quid now - not bad seeing as I've had hundreds of what would have otherwise been uncomfortable nights on mine!!
Something you might not know: the more you have underneath you the warmer you'll be, obviously because the cold ground just leeches the heat from you - these things make all the difference!!
Now available in lots of sizes as well as a super lightweight & luxury version (for those lushes amongst us!), they also come in full length & three quarters.
Newer versions have a special non slip coating on one side to stop you sliding down that slope you pitched your tent on (or so you know you're not moving when the whirling pits close in!!).
Top tip, don't blow em up too hard (yes they are largely self inflating!) as this makes them harder to stay on.
Don't worry if you puncture, repair kits are readily available!
There is a chair kit availble for these (sit in it as well as sleep on it!) & a joining kit for those looking for the double bed option! (requires 2 thermarests).
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