I sleep in these in Spring/Autumn - really make a difference (and only 90g) and usually an Icebreaker 240 LS top which is my normal day wear.
You might find a silk liner adds 1 or 2 degrees to comfort level as well - i find it blocks out cold spots.
And a lightweight down jacket nearby just in case.
I use a 275g down bag to 0c like this but once it goes below 2c it starts to cut it fine and i usually need the down jacket.
what Guy said...yes I use Rab powerstretch. for walking,sleeping,
and when nature calls in the night you are ready for that also ... for all but hot weather.
in the rain all I use is Montane featherlights pants for wind/rain/warmth. the "tights" dry out if they get damp at all, you dont notice any as there is no cold wet flapping trousers around your legs as its in direct contact with your skin, so any dampness is not felt and dries out in seconds.
Simon depends what do mean by 'colder conditions'. Because at the end of the day a set of technical pajamas is only going to add a bit warmth to your bag.
Thickness is a good crude guide to warmth. So if it's really cold then a warmer sleeping would a good idea. A cheap option might be to look at using a lightweight synthetic bag as an over bag in the coldest weather.
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