Women's Alpha Zero Jacket

When I opened the box I was disappointed. Very thin and light. No way is this going to be warm. In a stiff wind and fifty degrees, it certainly is warm. At zero...I don't ride in that. I am willing to push 40°f in this. I was impressed that the wind is not a variable in the weather anymore. If there is one drawback the jacket length is a little short in the back. I'm 5'2" and I wear small.