In reply to musashi:
Thanks everyone for the advises.
To be precise I will be flying to El Calafate; from there I am planning to go for few days around the Fitz Roy and then to the Torre del Paine..possibly the full circuit..otherwise for the so called W.
After that I will be heading down to Ushuaia..visiting the Tierra del Fuego NP and ideally the Isla del Dientes trek...
I have been warned about the strong wind, but obviously to understand it fully you have to be there.
I don't know Geodesic tents very well, they look good and solid..but they seem to be quite heavy (minimum 2 kg)..so yes, weigh is an issue as travelling for a month I would like to keep my backpack under 12Kg (more or less).
Any lightish Geodesic?
Thanks anyway for the very good advises.