I like those tights ... i wear them to sleep as they are warm and comfy ... yet if you are looking for a super warm base layer (for indoors and outdoors) this is not your choice as the material isn't made for that ...

Update: after a few washes (cold water) i found out - to my dismay - that they became looser especially at the waist area ... they are no longer as tight and snug. This is my 4th Duofold product and after my experience (with both tops and bottoms) i decided i have had enough with this brand ... first their sizing is weird, i am usually a medium or a large yet i got x-large pants (according to their sizing chart) ... they are not as warm as promised (i decided to use my thermal tops as regular  t-shirts rather than base layers ) ...

after much trial and error i found out wool to be the best base layer (expensive but worth it) and then Cuddl Duds (i am very happy with those) ...