My partner is quite seriously ill and has to keep warm even when he can't move around. These, and several other pairs, do the job perfectly. They've become like his security blanket and only come off when the odd rare heat wave arrives.
Fortunately, they don't show as being thermal lined so he doesn't look odd wearing them when other people are in shorts. They look like normal lightweight trousers, a bit baggy, but ok.
We have tried other brands including Rohan, but these, despite being fairly cheap, are much the best. The Rohan ones look much smarter but their waists are too tight and high, and since he has breathing difficulties, a loose fitting lower waist is important to him.
They wash and dry extremely well.