I bought them for my husband to wear as pajamas.  He spends 3-4 nights a week in the desert and the temperatures do go down into the 30's. Also as he has gotten older he is very sensitive to cold and has to be careful not to get chilled.  He is also in a not too well insulated solar cabin and working outside in the wind during the day. I just bought a 2nd set for him to wear during the day.

He really likes them and finds them very effective.  He is not too tall but has always had wide shoulders and legs. Also he does not like stuff that is tight.  So he needs a large, but likes the x large better.  When he sweats, it wicks the water away from your body and still keeps you warm