So far, great!
It's still pretty warm here in NY but we went ahead and bought this anyway since that's bound to change soon and I wanted to be prepared. That said, I love this blanket. The design is smart - it was easy to figure out how to size it down for our 3 month old and how to attach it to the car seat. It is very well made and keeps the little guy warm and cozy. He would say he approves if he could.