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Am side sleeper, have Alpkit Numo. It's alright and I've happily bivvied on it down to -5° or so (at a guess). However, I have had three leaky valves. 2 sent back immediately, the third one didn't leak at first but started to not long after. Sealed it up with superglue though.
Probably wouldn't recommend the Numo but Alpkit do have other mats that are fairly cheap and probably decent
Anyone have a cheap inflatable sleeping mat recommendation? I'm a side sleeper, don't want to spend a hundred quid (or sleep on the floor).