Basically Sitka is taking what companies like Patagonia, Mountain hardware, Rab, ect ect have been doing for YEARS and giving it to hunters.
They arent doing anything new or exciting, just offering great fabrics and concepts in camo patterns... basically.
I too have been wanting some sitka gear, paticularly there pants.
But if your not familiar with that style of clothing, you maybe some what disappointed. It is not a single layer system, in fact it is as far from that as can be. Most of there products are individual layers which when used together equal a ideal system.
For the whole enchalada youll be looking at base layer, insulation, perhaps a softshell layer, hardshell.
Im very familiar with this layering system, I just have not used Sitka brand clothes to accomplish it.