I just love these boots.  They run 1/2 size small so if you normally wear size 11 then you will need to order 11.5.  They are definately waterproof and I have heard they may be warm and sweaty if warn in the summer.  I live in Upstate NY so we are usually cooler than most areas.  I would definately buy another pair.  They are the most comfortable I have ever worn.