Sometimes too warm which is a great thing when it comes to my wife. I have the men's and we're both impressed.
I love my original AmFibs, had 2 pairs, lost a ton of weight, and ordered the right-sized pair.
The fit was a bit tight, but I literally could not get them over my heel without major gymnastics.
Bring back the zipper!
Wife loves them. She is always cold except when she wears these. They've done great for running and wearing over bibs.