I have the high Muck Boots and have used them for many years.  I love them but needed something lower to tramp around the woods in.  I got the Jobber Muck Boots and love them as much as the high ones.  Yes, they're a little roomy for my feet, but I put a pair of gel insoles in that I had lying around and they fit much better.  That will also help keep my feet warmer in the winter with the insoles too.  Would definitely recommend these if you need something you can get wet but not be too hot with.