Specific measurements! I read all the reviews - twice - and still came away fairly confused about sizing.  Maybe I can help somebody.  I bought size 8. I can get my foot in 'em but they are too small for comfort.  I took out a ruler and measured the bottom of the boot's sole: 10".

[But I can pull a pair of Land's End hiking boots size 8 out of my closet right now and tell you that their sole measures just under 11". And some Pogo athletic shoes by Reebook size 7 that ALSO measure just under 11". Confusing!]

If you want to measure your own foot, like I did and found my foot is a shade under 10", about 9.62", you can find instructions by doing a search on the best known engine, "measure your own foot."  In short, you trace your bare foot, keeping the pencil straight up and down, then take a ruler and draw a line across the furthest points. Measure from one line to the other to get your measurement. You deduct a slight amount, 3/16" of an inch, to allow for the extra distance created by the fact that the pencil mark is drawn just outside your foot. You can do the same process to find your foot width.

These measurements have corresponding sizes, which you can find on a basic size guide.  The last line of the Sloggers product description says "Click here to see our Size Guide!" Well, on my computer screen there is nowhere to click. However, I went looking on the internet by searching the words "shoe size conversion."  I never saw any of these charts before and was always a bit hazy on how shoe size is measured - this helped a lot.  According to The Official Guide, my shoe size based on 9.6", is what I generally believe it to be (and most of my shoes are), 8.5. Meaning, I would be better off with a size 9 Sloggers.  So hopefully, these specfic measurements will help somebody else decide "if the shoe fits..." before buying.

Edit May 2011: I've since purchased the size 9 and I can tell you the bottom sole measures 10.25" end to end - and they fit me with not much extra room.  Hope this helps!

Update Nov 2011: I realized in my emphasis on sizing I neglected to say much about the boot itself. They are very cute but a duller color than in the product photo; I posted my own photo under Customer Images which gives a more realistic color. They definitely attract compliments and look great with jeans or short shorts (inbetween pants lengths, like capris, look odd with the boots' wide leg opening).  I'm a tad suspicious about the totally waterproof claim.  I recently had the misfortune to have to slog through water wearing the boots and after one of my socks was a little damp.  But they're great for regular rain conditions.

Update Jan 2014: I still have and wear my sloggers. They definitely attract attention & compliments, from *both* women and men which is somewhat unusual! I appreciate the thick sole but it's worn at the heels now. I try to be careful with them so as to not scrape or otherwise mar the surface of the boots and they've held up well, even under heavy gardening conditions and many miles of walking.

In case you're wondering why my review spent so much time on sizing, etc., at the time I wrote it there weren't all those nice photos and descriptions of the boots on the product page, such as a photo of the sole (a important feature).

June 2014: 3 years in, lots of use, a great purchase. I'd buy again - if the price was right!

CLEANING TIP: add a little dish detergent when rinsing with water. It brings back shine. Who knew?!