I was out today on an all day sit. Morning was in the high 20's and the daytime high was about mid 30's. I had 5 layers on (2 were fleece) plus a winter hat and still shivered most of the day. The problem was the steady 15-20mph winds. The problem is always the wind I think. It's the wind that penetrates through no matter how many layers you got on and kicks your behind. I believe a wind breaker of some sort right inside the outer most layer will have day and night affects.