I was hesitant to buy this jacket in March with high hopes of it being warm soon, but in NE Ohio, who was I kidding? I've gotten so much use out of this jacket, I absolutely LOVE IT! I have no idea how it does this, but it is so warm when I need it to be, and even on those teasing spring days when the sun is out and its 60 degrees I still wear my monkey jacket and am perfectly comfortable. I would wear it all day everyday if I could, best money I've ever spent! And my favorite thing about it, its not the typical North Face jacket that EVERYONE has, if you hate conforming to trends like that.