I have a TPeaks from several years ago. I think it's now gone to SIicon-impregnated nylon and more recent versions are lighter than mine, which I think is urethane-coated.

There are two mesh-backed vents at both peaks and they are held open with very small hoops.

The door is not backed by mesh.

It is marginally larger that Black Diamond Betamid. It was advertised as being particularly suited for ski-touring.

The Twin Sisters is similar, and more clearly designed for winter use.

I find that Twin Peaks is a very stable tent in wind, and is very suitable for winter IF snow is available for sealing the margins at ground level.