well, I would like to have a weathershield, after hearing all the good it can do, but what should I make it out of:
1.1oz RS- this is light weight and can provide moderate wind protection. call it the normal.
1.9oz RS- like the 1.1, but heavy duty. better at blocking wind, but it is a little heavier.
1.35oz sil- this will block much more wind and all rain, but will not breathe.
WP/B- whatever waterproof and breathable material you can use. WP/B are not very breathable except close to the skin, so similar to sil.
I am leaning towards a 1.1/9 top and a 1.1/9/sil bottom (as long as there is room between that and the quilt.