In reply to Earthling:
I tried out the Helium, but it was TINY (I am 5 foot 10).
I was unable to sit up in it.
If you want a winter tent that is really light, what about one of the Go-Lite single skin floorless tents? Bags of room for little weight, and you can dig "furniture" in the floor. I have the old Hex (now Shangri-la 3) and it is a fine tent. Oodles of space and weighs less than a kilo. You need to use care, though.
If you want a tent with an inner and with a vestibule big enough for cooking, what about the Lightwave T0 xt?
Or a really strong relatively light easy to erect tent: one of the Hillebergs (they will all do the job).