You'll see the same, but more in-depth comments, on my review of the men's pants from the same company.

This is ultra thin, stocking weight material. If you want something barely there and see through, this is good. If you want insulation, get Lands' End for Silk, or I highly recommend Icebreaker for wool.

You will definitely need to wear something over this unless you want everyone to see your body. With the LE or Icebreaker stuff, you can lounge around the house in them and not run for the bedroom if unexpected company knocks at the door.