I do cotton long pants and sleeves over Underarmor boxer briefs and T-shirt. In the pack are a wool watch cap, wool gloves, a Filson wool vest and Frog Toggs rain suit; less than 5lbs total, and not too bulky. I also carry enough fire starter to start a fire under ANY conditions. Most of my hypothermic experiences have been early season, in the morning - not during cold conditions. I'm not complacent about mild, early season weather.