Deermaster1, I have been testing some of the Sitka gear this year. It depends on what type of hunting you will be doing. If you are going to be walking and stalking, then the base-layer, mountain shirt, and 90% jacket will work fine at that temperature range. If you want to sit and glass you will need to put on the vest or some other additional layer. If you are planning on sitting in a deer stand for a long while, then you will certainly need to add additional layers since the 90% jacket alone won’t keep you warm enough. If you are planning on stand hunting, then you may want to get it one size larger to add additional layers. The original intent was to have a stream-line garment with low bulk for ease of stalking and slipping through the brush. Sitka is planning on introducing a new cold weather line this year and it will be out very soon. You may want to give that a try, as we are all anxiously waiting to try it as well.
As to your question of durability; the 90% jacket and pants is water resistant, quiet and stands up very well to brush and thorns. It is originally designed for mountain hunting and has a couple of vents and additional pockets. It washes well and most importantly dries very fast should you get soaked. However, the addition of the down pour rain gear will prevent that. The 90% material is very light in weight, which I like as well.
Most trad hunters are known to try a little bit harder, stay out a little bit longer, and get a little bit dirtier, but this 90% stuff stays pretty clean and will keep you looking sharp. Ha!
My point is, it will maintain its integrity and the camo pattern will hold up well. I have been very close to many game and non-game animals this year during hunting and filming, and I am very pleased with it. It worked very well for my needs this year. This is my opinion and my first impressions of this new gear. Mike