I have several sets of UA gear ,and what I like doing is if the temps are in the 30's I'll wear just plain old UA cold gear with my bibs and jacket. If it's in the 20's I wear my 2.0 base with the cold gear over it, and in the teens I'll wear my 2.0 base in and pack my 5.0 in along with my bibs and jacket. Reasoning behind packing several areas I hunt at Ft Campbell are over a mile walk with my stand and bow. No complaints about UA here, plus if you've got questions about how to layer the items you have you can call them . See I've always been told regular cold gear goes against your skin, that's not the right way if your planning on wearing the base layers also. Best insulation out there is dead air space.