I bought these in black and I think they are AWESOME!!  I also got the matching fleece top.  I wear the outfit around the house on weekends and it keeps me very warm and they are SO comfortable.  The fabric is very soft and cuddly and they seem well made....no twisted seams or itchy parts.  They do run a bit on the large side and they stretch so order a size or two down.  I'm keeping watch for them to go on sale so I can order more.  Perfect weekend lounge wear!!  Wearing them alone keeps me very warm so I imagine if you actually wore them as a base layer, you'd be VERY warm!