Hello, I need your help here to figure out what Kilt to buy.

I'm going 100% kilt and I drive a Tractor/Trailer all over the USA.
Keep in mind that I'm setting on my Posterior most of the time.
In a 12 mouth period I can see a temperature range from -25°F (-32°C) to 115°F (46°C) plus.

With that being said, my question is: Will one of RockyR's USA Kilts 11 to 12 oz. Poly Viscose work for me, or should I get a 13oz or 16oz 5 yard Wool? Or a 13oz or 16oz 8 yard Wool?

From what I have read on the Forum, with the ease of care with the PV, I'm thinking that's the way I should go. But I'm wondering if the PV will be warm enough for the winter mouths.

HELP!!!