I am a HUGE Crocs aficionado, and I own five different varieties of Crocs, all size 8, all fit me perfectly.  They include the Caymen (now called Crocs Classics, which are my very favorite shoes of ALL TIME, but I digress), the Mary Jane, the Beach, the Specialist, and now the new Wrapped Mary Janes (fantastic for work in a business casual environment, btw).  I cannot understand, therefore, why this ONE type of Croc, the Marnie, is so vastly different in sizing than all the other Crocs, but mine arrived yesterday and I tried it on this morning, and the size 8's literally fall off my size 8 feet, they are so LONG.  I saw the reviews before I bought them, but I dismissed them because many reviews of other Crocs always say they are too wide, which is what I LOVE ABOUT CROCS (among MANY other things I love about Crocs), as I have a C width shoe, and Crocs are the first shoes in my entire life that FIT ME.  For this alone, I am eternally loyal and grateful to Crocs and all I wear are Crocs.  So I just assumed that the reviews saying the Marnies are too big were by folks with narrow feet and didn't apply to me.  Well, I was wrong.  It is the LENGTH of these.  They are not sized correctly, period, as I am definitely a size 8 in general, and specifically, as a person who owns tons of Crocs and is intimately familiar with Crocs, they are not like any other Crocs size 8.  They fit at least a half size bigger and, to me, they seem like a size 9 even.  Like I said, they fall right off me.  Mine came from a third-party seller so I don't know if all returns would be like this, but mine say I would have to pay the shipping, so I am not going to deal with that hassle, I am either going to give them to a friend, or try a great suggestion from another review, which is to put them into a dryer (not that I have one, but I digress again) for a few minutes and then immediately put them on, and they apparently will mold to my feet.  Several comments after the original review saying this confirm that it has worked for lots of folks, so it is worth a try.  One last thing:  I love Amazon, but it is too bad that, if shoes don't fit, you don't get free shipping on returns, as shoes are really a gamble and I don't order any shoes on line EXCEPT Crocs, because the Crocs 8's always fit me perfectly, until the Marnie.  WEIRD.  Other than the size, these are GORGEOUS, classic shoes that are perfect for work, church, going out to restaurants, etc.  High-quality and seemingly very comfortable, although they fall off my feet so I can't walk in them.  I will try the dryer method to shrink them.