I love these boots.  I had been looking for a pair of rain boots for a long time.  I have really skinny calves and I could not found a pair that fit snug against them.  These definitely fit snug (so much so I probably can not wear them over pants or jeans but that is ok by me.  I had tried on a couple of sizes at a local store before I ordered them through Amazon so I knew what size.  I tend to be a 7-8 and the 8 fit perfectly.  I wore them in the rain and they were great.  I would think they may be warm in the summer but my feet are always cold.