WOW!  These are grrrrrrrreat!  I wore them yesterday mowing the grass and doing yard work and got them dirty all the way to the top and then just hosed them off when I was finished.  I ordered my regular size 8 women's shoe and it fits perfectly.  I thought I liked the shoes, and I do, but these boots really serve the purpose for outdoor work.  I also buy and wear those two for a dollar yellow plastic gloves that come to mid-forearm (look like the Playtex ones) as they are really good for yard work and now with the boots, I'm the neighborhood yard woman all the other women love to hate because I do my own yard.

Update 9-12-12:  I did yard work yesterday and again wore my Sloggers Tallboots with my pants tucked into them to keep out ants, spiders, and grass clippings.  Because feet sweat inside these rubber boots I would purchase them in a one-half size larger, up to an 8 1/2, to facilitate removing boots from a wet foot which may or may not help.  I do it the old fashioned way now, I put the heel of my booted foot on the top stair of the deck and work the boots off.  Just hose the boots off and you're done.