I started wearing the Under Armour base layers a couple years ago and fell in love with them. Since then I have upgraded to their gloves, balaclava, pants, and jacket. When wearing the base layer 1.0 under their pants and jacket (Hurlock style) I stay plenty warm on those cold days in the early season (15-30 deg) when stand hunting for a few hours. When the temperature dips way down and I am stand hunting for 4 plus hours I wear the base 3.0 with my Cabela's insulated pants and parka. The Under Armour gear is is pricey, but is extremely durable, light weight, warm and worth the money. I wouldn't hesitate to buy the Under Armour products again!