I have worked in commercial/industrial HVAC for the last 14 years so I am in very different conditions daily.  I have used Timberland PRO Titan's for the last 4 years.  They are light and comfortable.  This year I tried the waterproof style.  They work great.  I was concerned they would not breath  , so my feet would still be wet from sweat instead of water but not the case at all.  Everything was dry.