I purchased the LaCross Alpha Burly Sports last fall and loved them. They have a running shoe type sole and are very comfortable and light. They are made of a neoprene and lined with fleece. I used them in temps down to about 20 degrees and my feet did start to get a little cold, but would be perfect in a little warmer weather. I believe the Alpha series is being made this year in a warmer Thinsulate model, so I may buy another pair in the 1000gram model for the cold stuff. They are the most comfortable rubber boots I have ever worn. I have herd that Muck Boots are great also, but have never tried them.